A lip strap is a piece of Horse tack used on some types of curb bits and Pelham bits. The lip strap attached between the shanks and passes through a center ring on the curb chain. The lip strap attaches to rings at midpoint of the bit shanks and buckles on the near side. The lip strap helps keep a mouthy horse from mouthing or lipping the shank. It also helps prevent the curb chain from unfastening or otherwise moving too much.