A. Cooling Function and UPF 50 Protection: This cooling arm sleeve uses UPF 50 protection technology, which can block a large proportion of harmful UVA and UVB rays, reducing the need for you to apply sunscreen. Meanwhile, the high - elasticity fabric ensures you'll feel comfortable and pleasant whether indoors or outdoors. B. Wide Range of Uses: It is suitable for various outdoor sports and activities. Whether you're running, playing golf, basketball, tennis, rowing, fishing, cycling, driving, or doing gardening work, this anti - UV cooling arm sleeve can protect your skin from sun damage. C. One - Size - Fits - All Design: These cooling arm sleeves are designed for both men and women. They have high elasticity and a good fit, reducing the concern of them slipping off your arms. D. Superior Material to Other Brands: It is made from cooling elastic raw yarn (90% nylon and 10% spandex). It is cooler than some other brands and can offer better protection for your skin. You may reduce the use of sunscreen when engaging in outdoor activities. (Available in multiple colors: black/white/blue). E. Package Contents: The package includes 6 pairs of arm sleeves (black/white/blue). They are lightweight, breathable, and flexible, with anti - slip elasticity and thumb - hole cuff designs.