Over the sock boot stays flexible and won it crack in cold temperatures. Comfort rated from -60 to 32°F. Neoprene and polyurethane Aeroform shell features 15 mm of insulation over the top of the foot and 20 mm underneath for ultimate lightweight warmth. Polyurethane reinforcement on the shin over the neoprene provides added durability. Feature oversized polypropylene shank and polyurethane footbed. Winter tread outsole with generous surface area helps grip in wet conditions. Active fit to keep foot secure and comfortable while on the move. 14 height. Black. Men s sizes.