Thinsulate^™ Insulation is a microfiber material that is thin, warm and lightweight. It is one of the lightest and most compact insulations on the market. With the ability to retain heat even when wet, Thinsulate Insulation provides nearly two times the warmth when compared to equal weights of foam or felt insulation. Thinsulate Insulation is an ideal insulation for outdoor boots. Most insulation will break down after heavy use, but Thinsulate Insulation retains its insulating values even after extended wear. Thinsulate Insulation is measured in grams; 200 grams offers the least amount of insulation in footwear, while 1,600 grams is the highest level available in footwear.

Thinsulate is a trademark of 3M.