Fleece lining for warmth; Lightweight Midsole for All Day Comfort and Support; 5mm Neoprene Bootie for Comfort and Performance; Pull tab for easy on/off; bioDEWIX Anti-Microbial Footbed Insert Topcover with NZYM for Odor Control and Moisture Management; 100% Waterproof, 100% MUCKPROOF; Extended Rubber Coverage; Vibram Arctic Grip A.T for Wet Ice Traction Coupled with XS Trek Evo Adding Durability and Improved Grip on Wet and Dry Surfaces