100% Waterproof; 4mm Neoprene Bootie for Comfort and Performance; Breathable Mesh Sandwich-fabric Lining Improves Air Circulation; bioDEWIX Dry Footbed Insert Topcover with NZYM for Odor Control and Moisture Management; EVA Footbed; Wide Opening for Easy On/Off; Self Cleaning Ribbed Outsole; Subfreezing to 65degF / 18degC; 100% Waterproof; Available in Little Kids Sizes: 7 - 13; Available in Big Kids Sizes: 1 - 6