ArcticShield's Men's Boot Insulators lock heat in to help keep your feet toasty warm, even in the most extreme temperatures. Using patented Arctic Shield RE-tain™ heat retention technology to capture and hold more than 90% of your natural body heat, this incredibly efficient insulator has been proven effective at extreme temperatures well below 0°F. By positioning an aluminized middle layer between advanced thermoplastic fabrics, this heat reflection and return method is more effective than thick traditional insulations that only slow body heat loss. Lightweight, tough and naturally water resistant, these compact insulators feature rear-locking YKK® zippers to simply slip over your boots for total warmth even in sub-zero temps without the use of chemicals or batteries. Drawcord adjustment ensures easy on and off and a snug fit. Lightweight and packable covers simply roll up when not in use for easy storage in your hunting pack or jacket pocket. Per pair. Imported. Men's sizes:M(8-9), L(10-11), XL(12-13), 2XL(14-15). Camo pattern: TrueTimber® Kanati.