4 mm neoprene provides comfort and flexibility along with excellent waterproofing shock absorption and heat retention properties adjusts to the contours of your foot to resist blisters and chafing 100 waterproof womens boots are suitable for any season and any outdoor activity Lightweight and breathable mesh lining keeps feet well ventilated for longwearing dryness comfort rated from subfreezing to 65 F18 C Womensspecific last is designed to match the contours of womens feet Selfcleaning ribbed outsole offers added stability on slick surfaces easy onoff style with pullon tab