UPF 50+ UPF 50+ approved, the arm sleeves can efficiently block UV and protect your skin. It's a good choice when you're golfing, fishing, playing basketball, cycling, hiking, driving or even gardening. High-Elastic Made from high-elastic ice silk fabric which is comfortable and cooling to wear, features soft, quick-drying, breathable. Mesh knitting design, can better modify your arm line. Non-Slip An Unique silicone anti-slip strip was adopted to keep the arm sleeves from being slipped, suitable for vigorous exercises like cycling, hiking, basketball, etc.