The Waterbug will keep your child's feet warm and dry in winter. It features a Gore-Tex membrane which will keep water from entering the boot and has a waterproof and lightweight synthetic RubberHeShell. The Waterbug also has a 8mm Zylex liner made of polyester which wicks moisture away, keeps foot warmth and deflects cold air. It can easily be removed for quick overnight drying. An adjustable Snow Collar with Easy Grab Lace Lock and an adjustable midfoot Velcro strap provide a secure fit.