Using our seamless construction process we pulled off the impossible – making a boot that is both lightweight and durable. Add to that integrated snow cuffs and gaiters, and ultra-cozy fleece lining. Your kids will crush the snow. 100% Waterproof. Boot shaft easily adjusts to fit different size calves. DuraFresh natural bio-technology activates to fight odors.Durable, hand-lasted rubber with a four-way stretch inner bootie. BLOOM eco-friendly, algae-based EVA footbed that helps clean polluted water habitats. Comfort rated to -22°F/-30°C.