ATTENTION: PLEASE MIND THE SIZE CHART BEFORE BUYING TO ENSURE THE BOOTS FIT YOU. Waterproof Material: Made with 100% waterproof CR Flex-Foam, absorbs impacts, retains heat and flexes with your feet as you walk. Keep Warm: Heat-resistant insulation prevents radiated body heat from escaping, and returns up to 90% of your body’s warmth. Comfort Rated of Standard Style Boots: 4°F/-20°C to 50°F/ 10°C, Comfort Rated of 400G Insulation Style Boots: -22°F/-30°C to 41°F/ 5°C Lightweight Rubber Neoprene Boot – The unbeatable CR flex-foam boot is lightweight and completely waterproof, paired with 4-way stretch nylon to make your feet stay as comfortable as possible in your extreme setting. Anti-Slip & Added Protection: Self-cleaning ribbed outsole wraps perimeter for maximum stability and performance in mud and snow, protective rubber exteriors resist punctures while providing ample flexibility.