The Igloos CarbonASR Grid GaiterNeck Warmer is designed for the active enthusiast, excellent fit allows for adjustable coverage. CarbonASR Technology: This product is built with heat regulating technology inherent within the yarn. The yarn absorbs your body's warmth, stores it, and releases it back to you when needed most. Maintaining your optimal temperature during your activity. | Igloos Carbon Asr Grid Gaiter in Grey