Glacier Tek’s new cool vest using completely biodegradable RPCM®, or Renewable Phase Change Material, contains no hazardous materials and has achieved patent-pending status. Employing a totally non-toxic, food-based product, the RPCM Cool Vest maintains a dry, comfortable 60°F temperature for up to 2-1/2 hours in hot work environments.Glacier Tek, Inc., Melbourne, FL.