FAQ
What is KOLDWR?
KOLDWR is a cooling boxer brief kit designed to protect male fertility during sauna and heat therapy sessions. The kit includes one pair of boxer briefs with integrated pockets and two reusable gel cooling packs.
Why do I need cooling underwear for the sauna?
Research shows that regular sauna use raises scrotal temperature significantly, which can impair sperm production, motility, and DNA integrity. Your testes need to stay 2–3°C below core body temperature for healthy sperm production. KOLDWR keeps them cool while you enjoy the cardiovascular and longevity benefits of heat therapy.
How does it work?
Place the gel packs in the freezer for at least 2 hours. Before your sauna session, slide them into the front pockets of the boxer briefs. The cooling packs sit against the scrotal area and maintain a lower temperature throughout your session.
How long do the gel packs stay cold?
In a sauna environment (80–90°C / 176–194°F), the gel packs provide effective cooling for approximately 15–20 minutes — enough for a standard sauna session. For longer sessions, you can swap in fresh packs.
Is it comfortable?
Yes. The boxer briefs are made from 88% polyester and 12% spandex — the same performance fabric blend used by major athletic brands. The gel packs are soft and flexible, conforming to your body. Most users report that the initial cool sensation becomes comfortable within the first minute.
What sizes are available?
We currently offer sizes S through XL. Check the size guide on the product page for measurements. If you are between sizes, we recommend sizing up.
Can I use it outside the sauna?
Absolutely. KOLDWR works for any situation involving prolonged heat exposure — hot tubs, hot yoga, long drives, or just hot climates. Some users wear them during workouts or while working at a desk for extended periods.
Is this a medical device?
No. KOLDWR is a wellness product, not a medical device. It is not intended to diagnose, treat, cure, or prevent any medical condition. If you have concerns about fertility, consult a healthcare professional.
When will my pre-order ship?
Pre-orders are estimated to ship within 8–10 weeks of purchase. You will receive an email with tracking information once your order has been dispatched. We ship worldwide.
Can I cancel my pre-order?
Yes. You can cancel for a full refund at any time before your order ships. Just email support@koldwr.com with your order number.
How do I care for the product?
Machine wash the boxer briefs on a cold cycle and hang dry. Remove the gel packs before washing. The gel packs can be wiped clean with a damp cloth. Do not microwave or puncture the gel packs.
Is KOLDWR affiliated with Bryan Johnson?
No. KOLDWR is an independent brand. We reference publicly available research and protocols to educate our customers about the importance of testicular cooling during heat exposure.