Cooling Arm Sleeves:Made of Cooling Fabric Material. Unisex, high elasticity, does not creep down from your upper arm, fit very well, no pressure or discomfort in any activity. Size of Sun Sleeves - Approx 36cm length, width about 9 cm. Great for women and small arm framed men. Anti-UV Arm Sleeves: our cooling sleeves can help to protect your arms from the cruel UV radiation in summer and prevent pulled muscle while doing outdoor activities, sports, etc. Thumb hole design, provide protection on your palm and arm against sunburn. Soft, Skin-friendly. Feel cool in summer, and Feel warm in winter. Great for outdoor activities - Such as golfing, cycling, fishing, driving, jogging, climbing, boating, gardening, basketball, tennis and so on. You can even wear them inside air-conditioned office to keep your arms warmer.