“I tested it in in extreme conditions and it will keep you alive where other materials will fail”





Duvet Insert (3/8")
100% Risk Free Warranty
Ships within 4-5 business days.
Why?
Compromised sleep substantially increases the risk of fatal accidents and is a significant contributor to all chronic health problems. Everyone talks about needing more sleep, but the real problem is the quality of sleep. You fall asleep, then wake up hot, then cold, then hot again, kicking off blankets, pulling them back up, constantly adjusting to get comfortable. Each interruption pulls you out of deep and REM sleep, the most important stages for recovery.
How?
The K3core insert strips away excess heat and trapped moisture, stabilizing the climate beneath your covers and shielding you from external and internal temperature swings. By keeping your temperature stable, you achieve uninterrupted, deep, and restorative rest.
We do:
- Temperature-stable comfort down to 30°F (-1°C) and below
- Built for everyday comfort, trusted for extreme conditions
- Eliminates hot and cold cycles
- Self-drying, removing excess moisture
- Sheilds from changing room conditions
- Made with 3/8 in. (10mm) Keloflex™
- 4 corner attachment loops keep the duvet insert securely in place
- The outer shell is 100% microfiber polyester fabric
- Machine washable, double spin cycle, hang to dry
We don't:
- For best results, avoid using Cotton or Spandex with this system
What Real Comfort Sounds Like
“It’s like sleeping in a cloud.”
“I tried it in December, in Idaho, in snow and wind. I slept very well! I couldn’t believe it.”
“I am finally able to sleep comfortably through the night. I haven’t been able to do that for years.”
“I wouldn’t dream of using anything else.”
“It was my comfort blankie, I started sleeping in it every night.”
“It is like crawling back into your mother's womb.”
“Recently received the K3core Duvet. It was the deepest night’s sleep I have ever had. We both love it and it looks great!”
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