Exremely warm and ligtweight winter boot protetecting down to -50 degrees! 100% EVA material rich in micro bubbles foam rubber for perfect thermal insulation ability Extremely lightweight - weighs 30 - 40 % less than rubber or PVC boots Removable insole protects down to temperatures as low as -50 degrees Superior 3 layer 10mm insole ensuring thermal insulation Polyester layer absorbs and wicks away moisture Foil repels cold , maintaining the body temperature 4mm felt layer and polar fleece lining retains warmth Snow protection made of durable nylon and fixed by snap