... ice or refrigeration colloid, using air as cooling medium, Foldable and washable,military qualitySummer Air-cooled/ Air-condition Waistcoat/Vest=Specifications=1.Internal material ... Do not dry clean or iron.8.Packing detail: Packed by carton, 20pcs a carton. Carton size: 500mm(L)X300mm(W ... work time.5.No need ice or refrigeration colloid, using air as cooling medium, which is the most comfortable way ...