"Stay out longer in ArcticShield™ gear. A unique layer of REtain -- a multi-layered, heat-resistant thermal barrier-captures and returns up to 97 percent of your body heat.These Unisex Overboot Insulators keep feet warm when you're not moving around.Just slip over your boots. Ht. 8"". Closeouts. China. Size: S(6-7) M(8-9) L(10-11) XL(12-13) 2XL(14-15) Unisex sizing, women order next size smaller."