The SKINS COMPRESSION Men's Long Sleeve Top Series 5 is a fitted long sleeve top with a high level of compression that provide targeted muscle protection, support, and comfort. High level targeted compression is supplied to the arm and chest muscles to provide support and aid in blood return to the heart helping improve performance. The moisture wicking fabric will help keep you dry and comfortable, and also protect you from the sun's harmful rays with UPF 50+ built in.