The Original RPCM® Cool Vest is a cooling vest designed for individuals with Multiple Sclerosis or high-temperature occupations. Inserted into the Original RPCM Cool Vest is the RPCM Cool Pack, which offers cool relief for up to 2.5 hours, maintains a constant temperature of 59°F for those 2.5 hours, recharges in 20 minutes in icy water; is non-toxic and non-hazardous. The Original RPCM® Cool Vest is made of a cotton blend, can be worn directly against the skin, is over the shoulder and side strap adjustable, has a heavy duty zipper on the front to quickly remove the vest. To recharge, put the RPCM® Cool Packs in icy water for 20 minutes, or keep them in the refrigerator or freezer so they are always ready. WEIGHT: less than 5 pounds. COLOR: Gray and Tan Khaki. DIMENSIONS: Original RPCM® Cool Vest: Width: 15 inches across from left to right when lying down (sides are open and have Velcro and elastic straps for adjustability). Length: 20 inches long from shoulder to waist and 13.5 inches at center from top of zipper to bottom seam (V-neck design). Chest Size: 37 inches - 52 inches (approx.); RPCM Cool Packs (set of 4): 13 inches x 5 inches.