Shires Nylon Web Side Reins Black. The Shires Nylon Web Side Reins make a colourful addition to your tack room and is ideal for working the horse on the lunge to help encourage the horse to work in an outline. The Nylon Web Side Reins are made out of durable nylon web material with buckle adjustment and trigger clips for easy attachment. The side reins feature elastic inserts to allow a freedom of movement of its head whilst maintaining a consistent and even contact. Create a fun matchy set with the bright colours available in the Shires range!