Updated: June 2026 · by Sonja Spörlein · Approx. 8-minute read
Hand on heart: There's little that's as annoying as a sensor whose edge starts coming loose on the first truly beautiful summer day, barely after you get out of the outdoor pool. I'm Sonja from Zuckerschmuck, I live with type 1 diabetes myself, and I know this summer sensor issue from personal experience, just like many of you in our community.
The good news first: If your FreeStyle Libre 3 doesn't stick as well in hot weather or your Dexcom G7 has problems after exercise, swimming, or sunscreen, it's almost never your fault. Heat, sweat, water, and skincare products put the sensor's adhesive strength under particular strain in summer.
In this article, we'll look step by step at why sensors can come loose more easily in hot weather, how to prepare your skin before applying the sensor, what manufacturers say about swimming and bathing, how to assess skin reactions, and how to gently remove adhesive residue after changing the sensor.
☀️ At a glance
- CGM sensors are only waterproof for a limited time. You can find the relevant information below in the table.
- The sensor's adhesive strength depends heavily on preparation: clean, degrease, and allow to dry completely.
- Sweat, sunscreen, water, and friction can affect the sensor's adhesive surface in summer.
- Zuckerschmuck tapes and sensor stickers are decorative accessories for personalizing your sensor.
- If your skin is itchy, weeping, or repeatedly irritated, you should seek medical advice.
First, a brief note: This article is a guide from the diabetes community and is not a substitute for medical advice. If you experience skin reactions, please speak to your diabetes or dermatology practice. You can find the detailed notice at the very bottom.
Why does the sensor come loose in heat and when sweating?
The reason is often right at the sensor's adhesive surface: moisture, skin oils, and heat can affect the sensor's adhesive strength. Sweat can get under the adhesive surface, while high temperatures can soften the adhesive layer. As a result, the first problems often appear around the sensor edges.
Then there are the typical summer classics: sunscreen on the application site, long baths, frequent swimming, and friction from a towel, clothing, or backpack strap.
Abbott explicitly names these exact factors - sweating, sunscreen, and water - as things that can affect sensor adhesion for FreeStyle Libre [1]. For you, that means a lot is already decided before you apply the sensor.
Sensor in summer: Swimming, showering and exercise
Most modern CGM sensors (CGMs for short) are waterproof, but only within certain limits. They are designed for everyday situations such as showering, swimming or exercise, but not for unlimited water exposure or deep diving.
How waterproof is my sensor really?
The manufacturer's specifications differ significantly. These values apply only to a correctly inserted sensor:
| Device | Waterproof according to the manufacturer | Practical tip |
|---|---|---|
| FreeStyle Libre 3 | up to a depth of 1 m, max. 30 min. [1][2] | According to Abbott, the adhesive has been IBOA-free since 2020 [6] |
| Dexcom G7 | up to 2.4 m (8 ft), max. 24 hrs. [3] | Dexcom supplies a manufacturer-provided overpatch; keep dry as much as possible for the first 12 hours [7] |
| Omnipod 5 (Pod) | IP28: up to 7.6 m, max. 60 min. [4] | Controller/PDM is not waterproof [4] |
| Medtronic Guardian 4 | Manufacturer specifications vary → check the current instructions for use | back of the upper arm recommended [5]; please follow the manufacturer's instructions |
In concrete terms: Showering, swimming and sweating are within these limits. A long dive, very hot water or a sauna can put additional strain on the sensor's adhesive surface. After a long swim, it is best to gently pat the area dry instead of rubbing it vigorously.
Prepare properly: Sensor adhesion begins before insertion
Abbott recommends this order, and it makes a big difference in summer [1]:
- Remove body hair from the insertion site if necessary.
- Clean the skin with soap and water; if you have oily skin or have applied sunscreen, also degrease it with a non-oily alcohol wipe.
- Allow it to dry completely in the air.
- Apply sunscreen generously, but leave the later insertion site free.
- After strenuous exercise, wash and dry the area again.
It sounds simple, but it is often the crucial step. Only on clean, dry, oil-free skin can the sensor adhere as intended by the manufacturer.
Customize your sensor: Decorative CGM tapes
Many people with diabetes do not want to hide their sensor, but instead customize it to suit their personal style. That is exactly what the decorative CGM tapes and sensor stickers from Zuckerschmuck are for (often also called self-adhesive sensor films).
Whether transparent, subtle, or colorful: A decorative tape can visually integrate your sensor into your everyday life or deliberately make it an eye-catcher. Waterproof designs are especially popular in summer because they suit swimming pools, vacations, sports, and active days.
Important: The sensor's adhesion, function, and wear time depend exclusively on the specifications of the respective sensor manufacturer. Zuckerschmuck tapes are decorative accessories and serve no medical purpose.
👉 You can find transparent, waterproof tapes for decorating your sensor in the Classic and Subtle CGM Tapes collection, for example the transparent, waterproof SCHMUCK-Tape for Libre 3 or the variant for Dexcom G7. And if you like: The same tapes are also available in colorful designs, because your sensor can certainly be visible.
Skin protection under the sensor: How to use barrier film correctly
A barrier film is an ultrathin layer between the skin and the sensor adhesive. When sprayed or dabbed on, the solvent evaporates after a short time and leaves behind a transparent, breathable film [13]. Dexcom lists barrier films on its page about irritated skin, but states that it has not tested their use with CGM and recommends discussing it with your healthcare team [8].
Three things are particularly important:
- Leave an opening: The skin must remain uncovered where the sensor needle is inserted. The sensor should only be applied to clean, dry, intact skin [8].
- Film instead of cream: Under the sensor, use a film-forming spray or wipe that dries completely. Oily creams or ointments can impair the sensor's adhesion.
- Keep it realistic: A barrier film can reduce irritation and mild irritative reactions [9][13], but it is not reliable protection against a true contact allergy. If symptoms recur, medical evaluation is important [10][13].
👉 Film-forming, often alcohol-free products are available in the Skin Protection + Adhesive Remover collection, such as the alcohol-free skin barrier film spray or the skin barrier film wipes. If you want to use an individually cuttable skin barrier sheet, you can find it as a skin barrier sheet for cutting.
Skin reactions to sensor adhesives: What to do?
If the skin under or around the sensor itches, burns, or remains red, there's no need to simply tough it out. The first important step is to distinguish between the two: Not every red patch is automatically an allergy. Medically, a distinction is made between irritative and allergic reactions. They look similar but have different causes and consequences [10][11][12].
| Irritative reaction | Allergic reaction | |
|---|---|---|
| Triggers | Moisture, occlusion, friction, mechanical stress | Sensitization to components of the sensor adhesive |
| Pattern | usually clearly limited to the contact area | may extend beyond the area of direct contact |
| Time course | often quickly, usually subsides more rapidly after removal | often only after weeks to months, may persist longer |
| Signs | redness, pressure marks, irritated skin | severe itching, blisters, scaling, persistent symptoms |
Typical triggers of a true contact allergy in CGM and pump adhesives include isobornyl acrylate (IBOA), other acrylates, and modified colophony [10][13][14]. Once sensitization has occurred, it usually persists, which is why avoiding the trigger is the priority [10].
What you can observe and prepare yourself, without replacing medical advice:
- Change and rotate application sites: Alternate application sites systematically, for example left arm, right arm, or abdomen, so the skin can recover.
- Test a barrier film: This may be more helpful for irritative reactions. The skin must be completely dry before application.
- Document the reaction: Note the photo, date, and affected device. This can also help later at the doctor's office.
And when should you see a doctor? In the case of oozing, severe itching, extensive or recurring reactions, and whenever several different devices cause similar problems. The usual procedure when an allergy is suspected is a patch test at a dermatology practice, if necessary with a special test series for medical devices including IBOA [10][16]. Your doctor should always decide on treatment.
Want to learn more? In our guide Help with skin irritation caused by sensors and insulin pump catheters, we collect experiences from the community on skin care, irritation, and protection strategies.
Gently remove adhesive residue: spray, oil, or wipes?
After changing the sensor, adhesive residue sometimes remains on the skin. The gentlest sequence is always the same: loosen it first, then slowly pull it off, then gently remove the residue. Pulling it off dry and abruptly can stress the top skin cells and is a common cause of irritated skin [10].
Here’s how to proceed in a skin-friendly way [9][10]:
- Loosen the edge and wet the adhesive surface with a suitable remover product.
- Let it work for a few minutes.
- Pull off the sensor flat, parallel to the skin and, if possible, in the direction of hair growth, while holding the skin taut with your other hand.
- Gently pat away residue without vigorous rubbing gently pat dry.
Which product is right when?
| Product | How it works | Good when … | Note |
|---|---|---|---|
| adhesive remover spray made from silicone | reduces adhesive strength and evaporates without residue | quickly and on the go, larger area | alcohol-free variants can be gentler on sensitive skin [9] |
| Oil such as baby oil, body oil, or citrus spray | dissolves oil-soluble adhesive residue while also caring for the skin | at home, very sensitive skin | wash thoroughly before applying the next sensor, otherwise adhesion may be impaired |
| alcohol-free adhesive remover wipes | measured amount for soaking and wiping | travel, small areas | gently pat dry, do not rub |
After removing it, it's best to give your skin a break. If needed, you can use a fragrance-free, lipid-rich moisturizer between applications. Before applying the next sensor, your skin must be completely dry and free of oils.
👉 You can also find gentle products for removing adhesive residue in Skin protection + adhesive removers, such as the alcohol-free adhesive remover spray.
Device-specific: FreeStyle Libre 3, Dexcom G7, Omnipod & Guardian 4
FreeStyle Libre 3. Wear time of up to 14 days, waterproof up to 1 m for 30 minutes [1][2][17]. The FreeStyle Libre 3 Plus has the same water limits and can be worn for up to 15 days [18]. Abbott names sweating, sunscreen, and water as summer risks for sensor adhesion [1]. One detail for sensitive skin: According to Abbott, the adhesive has not contained IBOA since 2020 [6]. This lowers the risk of exposure to a known triggering substance, but does not rule out other adhesive reactions.
Dexcom G7. Waterproof up to 2.4 m for 24 hours when the sensor has been correctly applied [3]. According to Dexcom, readings may only resume once you come out of the water [19]. After application, Dexcom recommends, among other things, rubbing around the adhesive area, pressing down on the sensor, and keeping it as dry and free from sweat as possible for the first 12 hours [7]. Dexcom includes a manufacturer-provided overpatch and provides its own application instructions. For irritated skin, Dexcom lists barrier films but points out that they have not been tested with the CGM [8].
Omnipod 5. The pod is waterproof according to IP28 up to 7.6 m for 60 minutes, but the controller or PDM is not [4]. Please always follow the current manufacturer's instructions for use in water.
Medtronic Guardian 4. Water specifications may vary depending on the source. Please check the current instructions for use here. Medtronic recommends placing it on the back of the upper arm for the best sensor lifespan [5].
👉 Custom-fit TapeGuard adhesive aids and decorative edging tapes are available for, among others, FreeStyle Libre 3, Dexcom G7 and Enlite/Guardian; you can find an overview in the TapeGuard adhesive aids collection. They help you apply decorative sensor tapes evenly and neatly. We show you how it works step by step using the example in the post Applying Dexcom tape with TapeGuard. And for everyone who likes a splash of color: sensor stickers are available to match many CGM systems.
FAQ: Sensor, summer & skin
Is the FreeStyle Libre 3 or Dexcom G7 waterproof?
Both sensors are waterproof, but for a limited time: the FreeStyle Libre 3 up to 1 m for 30 minutes [1][2], and the Dexcom G7 up to 2.4 m for 24 hours when correctly applied [3]. Longer or deeper diving is not intended.
What can I do if my sensor does not stay on or comes loose while swimming or sweating?
Sensor adhesion depends on various factors, including skin preparation, sweat, water, sunscreen, and the properties of the particular sensor. Always follow the sensor manufacturer's recommendations and make sure your skin is clean, dry, and free of oil before applying the sensor.
Skin protection under the sensor: film or cream?
A film-forming spray or wipe that dries completely. Oily creams should not be applied under the sensor because they can impair adhesion. When applying it, leave out the insertion site [8].
What can I do about skin reactions to sensor adhesives?
Change and rotate the application site, test a barrier film, and document the reaction. In the case of persistent, oozing, or widespread reactions, please have them evaluated by a dermatologist [10][16].
How can I remove adhesive residue without irritating the skin?
First soften the adhesive with spray, oil, or a remover wipe, then peel it off flat and in the direction of hair growth, gently dabbing away residue [9][10]. If you use oil, wash the area thoroughly before applying the next sensor.
Does a barrier film help with an allergy?
A barrier film can reduce irritation because it reduces direct contact between the skin and the adhesive. However, it is not reliable protection in the case of a true contact allergy, as the triggers can penetrate the film over time [10][13]. Medical evaluation and, if necessary, changing the system or application site are then important.
Are Zuckerschmuck tapes medical devices?
No. Zuckerschmuck tapes and sensor stickers are decorative accessories for customizing CGM sensors. They are not medical devices within the meaning of the EU Medical Device Regulation and serve no medical purpose.
Your summer belongs to you
You don't have to sit out the summer just because a sensor is attached to your arm. With good preparation, the pool, sea, sun, and sports can be just as much a part of your everyday life as usual.
Whether you wear your sensor discreetly, transparently, or colorful as a small eye-catcher is entirely up to you. Zuckerschmuck stands for diabetes accessories that make your everyday life more beautiful and give you the opportunity to customize your sensor in a way that suits you.
Zuckerschmuck has been around since 2015. We are a specialist retailer for diabetes accessories and a community all in one, with over 46,000 customers. Do you have your own summer trick that works reliably for you? Feel free to message us info@zuckerschmuck.com, we share the best tips with the community on Instagram and Facebook.
Together, we are strong 🌈
Yours, Sonja and the Zuckerschmuck team
Note: This article is a guide from the diabetes community and is not a substitute for medical or dermatological advice. If you experience recurring skin reactions, suspect a contact allergy or notice unusual symptoms, please contact your diabetes or dermatology practice. The skin protection and care products mentioned are not medications. In a medical emergency, call: 112.
Note on Zuckerschmuck tapes and sensor stickers: The sensor tapes, overlay tapes and sensor stickers offered by Zuckerschmuck are decorative accessories for customizing CGM sensors. They are not medical devices within the meaning of Regulation (EU) 2017/745 (MDR) and serve no medical purpose. Statements about adhesion, wear time or water resistance refer exclusively to the respective sensors and manufacturer information.
Related
- FreeStyle Libre 2 review: A direct comparison with traditional blood glucose testing.
- Dexcom G6 after five years: An honest long-term review of experience with the sensor.
- Gifts for people with diabetes: What goes down well and what is better left on the shelf.
Sources
Methodology: Manufacturer information (IFU/FAQ) and specialist literature were cross-checked; where information differs, for example for Guardian 4, this is indicated in the text. Sources are numbered in order of first mention.
- Abbott. Sensors in summer: Tips for better adhesion. FreeStyle Libre DE (manufacturer information page). freestyle.abbott/de-de/artikel/sensoren-im-sommer.html · Accessed: 09.06.2026.
- Abbott. Bathing with the sensor / Sensor water resistance. FreeStyle Libre Help FAQ (manufacturer/IFU). freestylelibre.de/hilfe/haeufige-fragen/sensor/baden-mit-sensor.html · Accessed: 09.06.2026.
- Dexcom. Can I get Dexcom G7 wet? Dexcom FAQ (manufacturer/IFU). dexcom.com/en-us/faqs/can-i-get-dexcom-g7-wet · Accessed: 09.06.2026.
- Insulet. Omnipod 5 Automated Insulin Delivery System: Technical User Guide (manufacturer/IFU). omnipod.com/sites/default/files/Omnipod-5_User-guide.pdf · Accessed: 09.06.2026.
- Medtronic. CGM & Sensors Product Support. Medtronic Diabetes (manufacturer support). medtronic.com/en-ca/diabetes/support/product-support/cgm-sensors.html · Accessed: 09.06.2026.
- Abbott Support. Does the FreeStyle Libre 3 (Plus) sensor contain IBOA? Abbott FreeStyle Support FAQ (manufacturer). IBOA was removed from all FreeStyle Libre sensors in 2020; Libre 3 does not contain IBOA. support.freestyle.abbott/hc/en-us/articles/39979428421265 · Accessed: 09.06.2026.
- Dexcom. How do I keep my sensor on for the full 10-day wear? Dexcom FAQ (manufacturer/IFU). dexcom.com/en-us/faqs/how-do-i-keep-my-sensor-full-10-day-wear · Accessed: 09.06.2026. Also: What can I do to keep the adhesive patch from peeling off my body? dexcom.com/en-us/faqs/what-can-i-do-to-keep-the-adhesive-patch-from-peeling-off-my-body · Accessed: 13.09.2026.
- Dexcom. How to treat irritated skin or rash from Dexcom adhesive? Dexcom FAQ (manufacturer/IFU). dexcom.com/en-us/faqs/sensitive-skin · Accessed: 09.06.2026.
- Messer LH, Berget C, Beatson C, et al. Preserving Skin Integrity with Chronic Device Use in Diabetes. Diabetes Technology & Therapeutics, 2018;20(S2):S254-S264 (peer-reviewed review). PMC6011799. pmc.ncbi.nlm.nih.gov/articles/PMC6011799 · Accessed: 09.06.2026.
- de Groot A, van Oers EM, Ipenburg NA, Rustemeyer T. Allergic contact dermatitis caused by glucose sensors and insulin pumps: A full review. Part 1. Contact Dermatitis, 2025;92(2):87-112 (peer-reviewed review). PMC11710928. pmc.ncbi.nlm.nih.gov/articles/PMC11710928 · Accessed: 09.06.2026.
- Hyry HSI, Liippo JP, Virtanen HM. Allergic contact dermatitis caused by glucose sensors in type 1 diabetes patients. Contact Dermatitis, 2019;81(3):161-166 (peer-reviewed study). ovid.com/journals/codr/fulltext/10.1111/cod.13337 · Accessed: 09.06.2026.
- Rigo RS, Levin LE, Belsito DV, et al. Cutaneous Reactions to Continuous Glucose Monitoring and Continuous Subcutaneous Insulin Infusion Devices in Type 1 Diabetes Mellitus. J Diabetes Sci Technol, 2021;15(4):786-791 (peer-reviewed survey). PMC8258506. pmc.ncbi.nlm.nih.gov/articles/PMC8258506 · Accessed: 06.09.2026.
- Shinkawa E, Washio K, Tatsuoka S, et al. A case of contact dermatitis caused by isobornyl acrylate in FreeStyle Libre: the usefulness of film-forming agents. Contact Dermatitis, 2019;81(1):56-57 (peer-reviewed case report). researchgate.net/publication/330933371 · Accessed: 06.09.2026.
- Mowitz M, Hosseini S, Siemund I, et al. New device, 'old' allergens. Allergic contact dermatitis caused by the Dexcom G7 glucose sensor. Contact Dermatitis, 2024;90(5):495-500 (peer-reviewed study). portal.research.lu.se/en/publications/new-device-old-allergens · Accessed: 06.09.2026.
- German Medical Association's Drug Commission (AkdÄ). Drug Safety Mail 2021-03 (authority/specialist information). akdae.de/arzneimittelsicherheit/drug-safety-mail/newsdetail/drug-safety-mail-2021-03 · Accessed: 06.09.2026.
- Oppel EM (Interview: Jossé S). Allergic to insulin pumps and glucose sensors: How can the problem be solved in diabetes? mein-allergie-portal, 2023 (specialist portal/expert interview). mein-allergie-portal.com/kontaktallergie/3716-allergie-auf-insulinpumpen-glukosesensoren-bei-diabetes · Accessed: 06.09.2026.
- Abbott. FreeStyle Libre 3 Sensor. freestylelibre.de (manufacturer). freestylelibre.de/produkte/freestyle-libre-3-sensor.html · Accessed: 09.13.2026.
- Abbott. FreeStyle Libre 3 Plus Sensor. freestylelibre.de (manufacturer). freestylelibre.de/produkte/freestyle-libre-3-plus-sensor.html · Accessed: 09.13.2026.
- Dexcom. Can I get the Dexcom G7 wet? Dexcom FAQ Germany (manufacturer). dexcom.com/de-de/faqs/kann-ich-das-dexcom-g7-nass-machen · Accessed: 09.13.2026.
