Craft Sportswear Men's Active Extreme 2.0 Crewneck Windstopper Windproof Lightweight Long Sleeve Training Shirt 100% Polyester Imported Tight fit baselayer item Thin, lightweight and elastic fabric that is channel-knitted to trap air and provide warmth Coolmax-Air fiber against the skin enhances cooling and moisture transport Body mapped mesh for optimal temperature regulation Craft is a Swedish brand specializing in clothing for endurance sports where performance and comfort are crucial for a good result Craft is the official apparel and footwear sponsor of Spartan Race