UPF 50 PROTECTION: Our compression arm sleeves are made of the highest-quality and lightweight material that can block out as high as 97% of harmful UVA and UVB rays to prevent sunburn, skin aging. You are maximum all-around UV protected all day long in any hot weather. They are prefect for outdoor activities: running, golfing, fishing, playing basketball, cycling, hiking, driving and even gardening.^ COMPRESSION SUPPORT: The sleeves can offer you great compression which will make you feel tight but not over to protect and support your arm. True compression that promotes blood circulation and oxygen flow, reduce muscle soreness. No matter what you do, the sports sleeves can give you the support you need.^ EFFECCTIVE PAIN REILFE: Most physical activity can cause vibration damage, resulting in microscopic fiber tears in muscles and joints. This leads to a sore, stiff body, and potential injury. The sleeves can deliver pain relief from muscle soreness, while boosting blood flow to aid recovery. It can be used as a lymphedema sleeve, tendonitis elbow brace, or to lessen pain from injury or medical problems in upper arm or forearm.^ BREATHABLE & COMFORTABLE: The moisture-wicking fabric are breathable comfort, while cooling in the heat, warming in the cold. Great to keep your hands dry. There are anti slip bands on upper cuffs stay-in-place performance, they help arm sleeves stay up well on your arms whatever you do. Keep you comfort all the day.^ CUSTOMER ARE OUR PRIORITY: Sizes vary from difference brands. Use the size chart in the picture as a reference. If your measurements are between sizes, go to a bigger size.