Far More Effective - Navkar Crafts oling men arm sleeves made of high-quality polyester/spandex, features extreme UPF 50+ protection against harmful rays. Far more effective than sunscreen in protecting your skin which lasts only for 2 hours and is messy. These sun protection arm sleeves block 99% of harmful radiation, Never get sunburned, tanned. Say goodbye to freckles and darkened arms this summer!