One on the best forms of restraint available is the Leather Neck To Wrist Back Cuff Combo. Movement will be severely restricted when wearing this type of restraint. The wrist cuffs are adjustable up to an 11 inch circumference and the neck cuff up to 19 inches, with both of them having metal buckle fastenings. The back strap measures 22 inches in length. All restraints are attached with carabine hooks.