Weaver Leather Synergy Sport Boots Perforated four-way stretch neoprene stays flexible, allows heat and moisture to escape and the horse's leg to breathe Non-restrictive ergonomic design provides a close fit that contours the natural curve of the horse's leg to allow for a full range of motion with less bulk Dynamic Sling System lateral suspensory support strap helps to prevent hyperflexion and soft tissue damage to the lower leg during strenuous maneuvers Premium elastic bound boot edges maximize durability, help keep dirt and debris from entering boot, and stretch with your horse's leg to allow for proper circulation Quick drying boot liner made from soft, smooth Lycra® is easy to clean and dries quickly High grade hook and loop closures on straps maximize boot life