Stay Warm - Air Activated Heated Vest w/Eight Body Warmer Packs - 2X High collar, handy zippered front pockets, adjustable elastic cord at bottom and zipper closure; delivers additional coverage and protection where you need it most. Black softshell upper and soft durable, 100% poly-fleece bottom to help hold in heat, w/ black poly-cotton elastic trim & a total of eight (8) built-in. HEAT PAX Body Warmer pockets. Sizes: S, M, L, XL, 2XL, 3XL. Colors: Black/Black, Include eight (8) HEAT PAX Body Warmers (5540) that deliver steady, comfortable heat to your torso for 20+ hours.