What Our Gearhead(R) Experts Are Saying:"When I finally wore out the original liners in my Wolvhammers, these replacements brought them back to life. They fit perfectly, pack out just right after a few rides, and dry quickly after wet days in the snow. A must-have if you're running your boots hard all winter."Our winter rides don't stop when the temps drop-and neither should our gear. The 45NRTH Wolvhammer Boot Liner brings fresh warmth, structure, and comfort back to your trusted cold-weather cycling boots. Whether your original liners are packed out or you're prepping for another long winter of fat bike miles, these swappable liners extend the life and performance of your Wolvhammers. Made from multi-layer synthetic insulation with a smooth interior and supportive fit, this liner slides in easily and keeps toes toasty on frozen commutes and snow-covered trails. Quick-drying and breathable, it's easy to remove after wet rides for overnight drying, so you're ready to roll again the next morning.