BLACKHAWK! Men's Short Sleeve Crew Neck Engineered Fit Shirt nylon Jersey knit 92% nylon / 8% spandex; and Panels: 95% polyester / 5% Lycra. Smooth matte-finish face surface reduces drag and bulk when layering and textured, brushed interior enhances moisture wicking Hybrid construction with stretch mesh panels enhances freedom of movement and heat dissipation that features fast drying material with antimicrobial treatment for odor control Machine Wash Warm, Tumble Dry Low, Do Not Iron, Do Not Bleach, Do Not Use Fabric Softeners El Salvador