Anonymous
Mar 30, 2026
Rating: 5/5
Reliable Japanese quality
Kobayashi never disappoints. These are thin enough to wear under clothes without bulging but powerful enough to make a real difference. Highly recommend for outdoor activities.
Description
Reviews
| Brand | - |
| Category | Health Supplies / Heat Patches |
| Origin | - |
| Brand | Kobayashi Pharmaceutical |
| Product Type | Disposable Heat Patch |
| Target Areas | Feet, Hands, Knees, Back, Shoulders |
| Activation Method | Air-Activated (Peel and Stick) |
| Average Duration | Up to 12 Hours |
| Maximum Temperature | Approx. 63°C (145°F) |
| Package Quantity | 10 Patches per Pack |
| Material | Non-woven Fabric, Iron Powder, Activated Carbon |
| Scent | Unscented |
| Country of Origin | Japan |
Anonymous
Mar 30, 2026
Rating: 5/5
Reliable Japanese quality
Kobayashi never disappoints. These are thin enough to wear under clothes without bulging but powerful enough to make a real difference. Highly recommend for outdoor activities.
Anonymous
Mar 30, 2026
Rating: 5/5
Lifesaver for winter commutes
I use these on my lower back during my morning train ride, and they keep me warm the entire way to work. They heat up quickly once exposed to air and stay consistent for hours.
Anonymous
Mar 21, 2026
Rating: 5/5
Essential for camping
Took these on a winter camping trip. Placed them in my gloves and boots, and I was comfortable even when temperatures dropped below freezing. Will buy again.
Anonymous
Mar 08, 2026
Rating: 5/5
Perfect for cold feet
I stick these on the top of my socks, not directly on skin, and my feet stay toasty all day. No more freezing toes while working from home in a drafty room!
Anonymous
Mar 07, 2026
Rating: 4/5
Great for sore knees
My knees always ache when the temperature drops. These patches provide gentle, steady warmth that really helps soothe the discomfort. Just wish they stuck a bit better on moving joints.
Anonymous
Mar 04, 2026
Rating: 3/5
Good but gets very hot
They work well, but sometimes they get hotter than I expect. I recommend testing one first before wearing it for a long period directly on sensitive skin.
Q: Are these safe to use while sleeping?
A: We do not recommend using these patches while sleeping. Since you cannot monitor the temperature or position while asleep, there is a risk of low-temperature burns.
Q: Can I apply these patches directly to my skin?
A: Yes, they are designed for direct skin application, but please ensure your skin is clean and dry. If you have sensitive skin, we recommend applying them over a thin layer of clothing first.
Q: Can I reuse the patches if I peel them off early?
A: No, these are single-use only. Once the adhesive backing is removed and the ingredients react with oxygen, the chemical process cannot be stopped or restarted effectively.
Q: Do these contain any latex?
A: The adhesive and fabric materials used in Warm Baby patches are generally latex-free, making them suitable for most users with latex sensitivities. However, always check the specific package insert for the latest allergen info.
Q: How long does it take for the patch to start heating up?
A: Once the package is opened and the patch is exposed to air, it typically begins to warm up within 5 to 10 minutes, reaching optimal temperature shortly after.