You should prepare at least one pair of this sleeve in the summer.UPF 50 Arm Sleeves is made of high quality polyester,breathable and elastic,It will make you cool. There are 3 sizes for you to choose，M: 18.5in*10.2in*7 in,apply for 10.2in-11.8in arm circumference;L: 18.5in*11in*7.5 in,apply for 11in-13in arm circumference;XL: 20.1in*11.8in*7.9in,apply for 11.8in-14.2in arm circumference. Application:Our arm sleeves are ideal for outdoor and indoor activities such as jogging,running,walking,biking, climbing, gardening and so on. PACKAGE:Including 2 pcs oversleeves,about 80 g weight. SERVICE:Please concact us if you have any question,we also offer the custom design,welcome to my shop,thank you. It is a great gift for your family and friend