Cooling Boxer Brief Kit Pre-Order
Protect what matters during heat therapy.
The problem: Regular sauna use exposes your body to extreme heat, and research shows that heat therapy can reduce sperm motility by up to 57% and normal morphology by 55%. Recovery takes 10+ weeks. Until now, there was no real solution beyond DIY ice packs.
The solution: KOLDWR Pro is the first purpose-built cooling underwear for sauna and steam room sessions. Integrated gel pockets hold BPA-free cooling packs that maintain the fertility-safe temperature zone for 30+ minutes.
KOLDWR Pro is the solution Bryan describes, engineered into a single product. Forget rigging ice packs to your underwear — this just works.
Yes. The gel packs cool gradually, not shock. The built-in pockets hold them securely with a fabric barrier so you never feel raw cold directly on skin. Most users forget they're there after the first minute.
30+ minutes of active cooling in sauna temperatures (80–100°C). That's enough for a full session.
Freeze the gel packs for 2+ hours, slide them into the built-in pockets, and you're ready. After your session, rinse the packs and refreeze for next time.
Yes. Remove the gel packs and machine wash cold, hang dry. The gel packs just need a quick rinse between uses.
The gel packs are designed for repeated use. Just refreeze after each session. They're built to last.
We recommend ordering your normal underwear size. The fit is snug to keep the gel packs securely in place.
| Size | Waist |
|---|---|
| S | 28–30″ (71–76 cm) |
| M | 31–33″ (79–84 cm) |
| L | 34–36″ (86–91 cm) |
| XL | 37–39″ (94–99 cm) |
First production run ships within 8–10 weeks of order. You'll receive an email with tracking as soon as your order is on its way.
30-day money back guarantee. Contact support@koldwr.com within 30 days of delivery for a full refund.
Yes. Multiple peer-reviewed studies show that elevated scrotal temperature significantly impacts sperm quality. KOLDWR is designed to prevent that damage from happening in the first place.
The kit comes with 2 gel packs, which is everything you need per session. We'll offer replacement packs separately after launch.