HEAT-OUT Base Layer Long Sleeve Crew Neck Top - LG, Black Hi-Tech Fabric blend wicks perspiration Full stretch and recovery for dynamic freedom-of-movement Anti-microbial treatment reduces odor Flat Seam construction layers comfortablyTo extend the life of your Heat-Out Base Layers, machine wash cold and hang to dry. Dry cleaning, use of bleach, and tumble drying are not recommended.