Chill out. The Dual Cool Cooling Vest & Cooling Kit doubles the chill for comfort in extreme heat. Designed with stretch panels for a close fit, the lightweight hydration vest features an embedded HyperKewl lining that absorbs water when you give it a quick soak (1-2 minutes). It slowly evaporates for a cooling effect that lasts 1-2 hours. For a greater cooling factor, lay inserts flat in the fridge, freezer, or cooler with ice water for a min 45 minute, then slip them in the interior pockets of the soaked vest. Expect 2-3 hours of refreshing coolness. A handy insulated tote stores your vest and four cool packs, plus room for a water bottle or two.