OccuNomix One Size Fits Most Navy Flame Resistant Cotton Phase Change Cooling Vest With Hook And Loop Strap Closure, Cooling Packs And Adjustable Mid Section/Shoulders. Cools for 2-3 hours, set at 58°, weights 6.5 lbs, Arc rating: ATPV = 7.2 cal/cm, NFPA 70E/CAT1