Machine Injected Molded Foam (MiM) does a superb job of protecting you and your sparring partner (a full 2.5" of protection over your knuckles). This set of sparring gloves is made of 100% cowhide leather. The cross-directional safety strap keeps your gloves firmly in place and lends excellent support to your wrist. One strap is elasticated to get a tight fit, and that strap is then covered with the second all-leather strap.