UPF 50 Protection & Cooling- Innovative and effective sun protection technology, combined with cool, breathable, and comfortable fabrics, offers comprehensive sun protection for your arms on hot days. It blocks more than 98% of harmful UVA and UVB rays while keeping your arms cool throughout. Whether you're an enthusiast of outdoor sports like running and cycling or a worker involved in outdoor transportation or construction, these sun sleeves will be highly suitable.Moisture-Wicking & Quick Drying- Those arm sleeves adopt a three-dimensional ring interweaving process and has a tight structure to form numerous hidden cross hollow ventilation holes, which can speed up air circulation, quickly absorb sweat, and discharge moisture. Even if worn for a long time, it can still stay dry and not stuffy. The tightly woven construction ensures the sleeves are durable and resistant to snagging, also offering protection from minor abrasions during gardening tasks.Slight Compression & Stay in Place- The high-elastic micro-compression fabric compresses muscles to enhance blood circulation, aiding warm-up routines and preventing injuries. It provides support for the arms during exercise, aiding quick recovery and maintaining muscle tone and vitality. The reinforced anti-slip design on the top of the sleeves keeps the sleeves in place for a long time without worrying about them slipping during exercise.High Elasticity & Hypoallergenic- Crafted from a four-way high-elastic fabric, it can be stretched and adjusted according to the thickness of different arms, and can flexibly fit men's and women's arms of different sizes. The chemical-free, cotton-like feel of the fabric won't irritate sensitive arms. Additionally, the sleeves can help resist irritating metal shavings and sawdust.360 Seamless Fit- The main part of the arm sleeve adopts one-piece weaving technology, which makes it fits naturally like a second layer of skin, ensuring maximum wearing comfort. You no longer have to worry about red marks caused by seam pressure mixed with sweat and itching. If you need temporary tattoo coverage while working, we believe these easy-on and off sleeves can also be of assistance.