Classic RPCM Cool Vest The Classic RPCM Cool Vest is constructed of heavy grade Tan Khaki or Camo material and uses the same RPCM Cool Packs as our standard RPCM Cool Vests. The Classic RPCM Cool Vests are fully adjustable with over the shoulder and side adjustments for a custom fit. They maintain a cool, constant 59° F temperature for up to 2 1/2 hours, weigh less than 5 lbs., and recharge in minutes. Get an extra set of RPCM Cool Packs so you will always have a set ready to use!