Keep yourself cool this year thanks to the Chill-Its Unisex Phase Change Cooling Vest Elastic Extenders. These vest extenders are made of 100% elastic with hook and loop extenders for lasting strength. Ideal for workers in pulp/paper, iron/steel, vulcanizing, foundries, etc. or for people running, biking, doing yard work, riding motorcycle and more. Each elastic cooling vest is 30%-60% lighter weight than other cooling vests on the market. Cooling vest extenders are made of 100% elastic with hook and loop extenders Increase the vest size as you see fit to conform to your body shape Vest packs maintain constant 64 degrees F temperature for up to 4 hours (sold separately) Cooling packs reactivate in as little as 10 minutes Elastic cooling vest is 30%-60% lighter weight than other cooling vests Grid ice pack design eliminates stiffness Hand wash with mild water for the best results Ideal summer work vest for workers in pulp/paper, iron/steel, vulcanizing, foundries, etc. or for people running, biking, doing yard work, riding motorcycle and more 3.5 in. / 9 cm elastic in length to increase the size of the Chill-Its Phase Change Vests (excluding lightweight vests) Chill-Its Unisex Phase Change Cooling Vest Elastic Extenders