These top draw Dressage Squares are half lined with 100% natural Australian Merino lambskin - the wool is much denser & softer than the older sheep wool used in many rival numnahs. The new clear spine is swept up at the wither relieving pressure on the spine and allowing air flow. There is now a strengthened girth strap protection area with double adjustable velcro straps for ease of saddle fitting. Ideal for putting competition numbers & logos on. It's well known there's nothing better for a horses back than natural wool - it promotes blood circulation, s fully breathable, maintaining optimum temperature in summer and winter - regulates humidity controlling the breeding of bacteria and viruses and prevents bruising, scarring, chaffing and pressure sores. If washed carefully on a wool cycle (max 30 degrees), or by hand, with WoolSkin wash (available from Horse Health) or non-biological powder or liquid these lambskin pads will last for years. We recommend that a fairly generous amount of HUMAN HAIR CONDITIONER (for dry hair) is rubbed over the underside of the lambskin prior to placing in the machine, if WoolSkin is not used. Always air dry. DO NOT tumble dry or place directly on a heat source.