4ucycling Compression Tight Shirt Base Layer Breathable Sleeves Fit Slim Sports Design for Work Out Blue/Black Quick dry with 86% polyester & 14% spandex, ergonomics design perfect fit with bodies Moisture Sensing with breathable mesh design from armpit to the elbow makes you feel more comfortable in the process of doing exercises Scientific material proportion reduces skin friction Inside and outside wearing are both ok for good shape and color combination.A good shield ultraviolet clothes for long sleeves with mesh area design Easily washing due to reasonable thickness and light weight