(Click on the Sizing Tab For Full Sizing Details) Shop Our Brand New Custom Baseball Number Arm Sleeve Made with elastic at the bicep to guarantee the sleeve stays up Sewn specifically to keep arms warm and loose on the field and in between innings Choose from Youth & Adult Sizes 30+ sleeve colors and 8+ baseball outline colors Customize with your jersey number or initials 300+ Custom Color Combinations Benefits Sports Nation gave it the 'Coolest Arm Sleeve Award' Worn in the Little League World Series Breathable fabric to keep you cool while your muscles stay warm and loose Single sleeve only. Designed for any sport. Proudly cut, sewn, and assembled in the USA - the way it should be!