The Chill-Its 6240 Phase Change Cooling Vest Extenders provide 3.5 of extension to the Chill-Its Phase Change Vests (excluding lightweight vests) to increase the size. They are made of 100% elastic with hook and loop extenders to attach to the vests. Apparel Type: Cooling Vest Extenders; Material(s): Elastic; Color(s): Orange; Color Family: Orange.