Measure your forearm while flexing with your elbow bent at 90 degrees

Or just impress your friends

-Forearm Circumference

This way it can land in your hand where you want it to go

Also good for thick costumes

Biomechanical Cyborg Gauntlets Size:M Measure your forearm while flexingSerrated metal armor, multiple organic styled layers interwoven with blue flat panel lights. Durable brushed aluminum construction. Inner surface is covered with soft black fabric. A wide velcro wrist strap meshes with velcro patches on the inside of the gauntlet. Holding the gauntlet tight against your arm as you move (not shown). Adjustable lower panel can expand or retract slightly to adjust for minor differences in forearm size and to rotate open