*Specifications*SBR NeopreneDouble Mauser stitchingDurable-yet flexible front panels4-way stretch lycra side panels*Sizing*Measure the circumference of your arm just above your elbow.Assassins start very snug and can take a few sessions to break in. If you measure on the higher end of a size. we recommend ordering the next size up.SM: 8 - 10MD: 10- 14LG: 14- 18XL: 18- 20