|Occunomix Pccs Phase Cool Light - Lightweight Economy Vest PCL. Lightweight, economy, 100% polyester mesh vest comes with set of 4 PCPL lightweight cooling packs, two for front and two for back. 65¦ Fahrenheit/18¦ Celsius Cooling lasts about ONE hour. Economy vest weighs approx. 2.8 lb. One size fits most with clip adjustment strap. Replacement cooling packs and outer vest also sold separately.