The mitten shells have an adjustable strap on the back across the wrist and an elastic take-up at the hem of the mitten opening.The thumb side has an opening for the trigger finger.  Turn any extreme cold weather mitten into a snow camo mitten with these military surplus snow camo mitten shells. Adjustable outer strap helps the shell fit snugly to your mitten.  Elastic gauntlet style cuff prevents the elements from entering into the shell.  Made of a cotton/nylon oxford cloth.  Water repellent. Universal size.