PREPARE TO BE COOL Our vest maintains a dry comfortable 59F for up to 25 hours in 100F heat HOW IT WORKS The cooling vest has four interior pockets that hold packs snug against the torso The charged packs will pull heat out of the bodys core which will lower effectively lowering the users body temperature and delivering a sensation of cooling It is simple science no gimmicks here The packs work as heat absorbers a cooling solution that keeps your clothes dry and works in humidity EASY RECHARGE The cooling packs recharge in about 20 minutes in ice water or a mountain stream one hour in the freezer or two hours in the refrigerator MULTIPLE USES Ideal for athletes construction workers landscapers MS patients and others Useful for anyone working in heat related occupations and people with heat sensitive medical condition Founded in 1997 Glacier Tek has been supplying cooling relief to satisfied customers for over 25 years ADJUSTABLE SIZING Designed for comfort and functionality the cool vest provides a full range of motion and features adjustable dual side straps adjustable shoulder straps and a heavyduty front zipper One size fit most however we recommend purchasing an extender set for chest sizes greater than 52 inches Available under ASIN B07D1R8SNF ADJUSTABLE COOLING To extend cooling relief beyond 2 hours consider purchasing a spare pack set available under ASIN B07FTTVPRT or a Glacier Tek Booster set ASIN B07NBTQHD9 The vest set fully loaded with 8 packs weighs less than 5 pounds For use in less demanding conditions such as indoor use you can make the vest lighter by using one cooling pack per pocket instead of two