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Get ready to pack a punch on the trail—we've got just the accessory you need. Columbia's Unisex Freezer Zero Arm Sleeves feature our best technology to keep you cool and protected during the hottest of days. High quality material and superior technology is the backbone of Columbia's trail accessories. The technology featured the fabric of these arm sleeves is unmatched. The exterior layer provides ultimate protection from harmful sun rays with UPF 50; while the cooling technology is made of blue rings that react with sweat to lower the temperature of the fabric to keep you cool and comfortable during any activity. The sides feature our signature logo for add style. Columbia offers the Unisex Freezer Zero Arm Sleeves in multiple colors and sizes.