EvoShield is one of the best brands in compression products from wrist guards to chest protectors. This arm sleeve is made of poly/spandex to better absorb sweat to keep you cool while on the field. The compression aspect helps decrease fatigue of your muscles to sustain your playing time. They also help support your muscles to prevent injury while encouraging blood circulation. The flat-lock seems make the sleeve tough so it won't rip on you during an important game. You can get these sleeves in sizes are small/medium and large/x large.