FEATURES: -Fully prevent sand and snow from entering the shoesSand sets of equipment is one of the activities under the harsh natural condition essential.In snow and desert conditions , it can prevent sand and snowfrom penetrating into the shoes , avoid foot wear , and play a protective role on the ankle to a certain extent - Composite waterproof and breathable 420D nylon,Waterproofindex is above 19000mmH2OMoisture permeability index is above 7000g / / 24h