Allegro’s Cooling Vests offer such features as fire-retardant Nomex® fabric, adjustable Velcro® closures or snaps, and high-visibility reflective tape. Non-toxic polymer fabric is activated by water, allowing composite to absorb and lock in water to cool for 24-72 hours. Patented Air Cooling Vest can connect to any clean compressed air source.Allegro Industries, Garden Grove, CA.