Mavic Thermo Shoe Covers Warm Shell ST is a softshell fabric with a brushed interior and a high degree of wind and water resistance DWR treatment repels light precipitation Warm Ride + Pocket technology uses double layer toe insulation to provide extra warmth and protection, plus there's an option to add a chemical heat packet for extreme cold TPU front pad for walkability Exo Grip elastic ankle grippers with silicone stay in position