Check the listing for details. Techniche TechKewl Phase Change Cooling Vest with Inserts - Black - 6626-BK-M/L. Condition: New. Listed at 119.99 USD. Techniche TechKewl Phase Change Cooling Vest with Inserts - Black - Medium/Large 6626-BK -New with Tags Stay cool with this Techniche TechKewl Phase Change Cooling Vest with CoolPax Inserts. Maintains a comfortable 58 degrees for 2 to 3 hours. The vest has a front zipper and adjusts at the shoulders and sides for a perfect fit. Medium/Large fits 100 to 175 lbs. To activate cooling, just remove the inserts from the vest and put in your freezer or ice water for 35 to 40 minutes. Then just put them back in the vest. They will also recharge in a refrigerator but will take longer. Use over and over again. Color: Black. You can store the inserts in the freezer or in inside the vest in a cool dry place. Due to our low price and free shipping, we do not offer returns.