S1 Wrist Guards are made with a highly durable, heavy weight ballistic nylon outer fabric and a high grade ABS plastic splint that disperses impact energy and protects the palm area. S1 Wrist Guards do not have a top splint in order to allow impact energy to disperse from the palm, to create more flexibility at the wrist joint and to prevent unnecessary injury to the top of the wrist bone on impact. S1 Wrist Guards are comfortable, built to last and come in a set with both a right and left included in a quality mesh carrying bag.To figure out what size you need measure the circumference of your wrist at the wrist joint and compare your measurement to the sizing guide below.