The 6691 Cooling Arm Sleeves are designed for cooling relief and added leverage when lifting bulky items. For an instant cooling effect lasting up to two hours, activate the sleeves with water. When worn dry, the soft, stretchy performance fabric draws sweat away from the skin, which also helps regulate body temperature. Whether wet or dry, the breathable knit fabric provides UPF 50+ sun protection from harmful UV rays and guards against light abrasions–ideal for landscaping or hauling