YOUR BODY WILL GRADUALLY HEAT THE COOLING ITEM AS YOU WEAR IT. IN HIGH HEAT, OUR COOLING ITEMS CAN RETAIN THEIR COOL FOR UP TO 40 MINUTES WITH PERIODIC ROTATING. IF YOU USE YOUR COOLING ITEM IN INTERVALS, YOU WILL KEEP COOLER IN THE LONG-TERM. KEEPING YOU COOL AND ALERT, REFRESHED AND ENERGIZED. *NOTE: WHEN NOT IN USE, OUR COOLING ITEMS WILL BEGIN TO EVAPORATE UNTIL THEY RETURN TO THEIR ORIGINAL STATE. OUR COOLING PRODUCTS ARE RE-USABLE SO YOU CAN USE IT WHEN IT’S HOT, PUT IT UP WHEN IT’S NOT.