Horseware Liner 200g Medium in Navy. The Horseware Liner 200g Medium is a medium weight under rug ideal for adding that extra bit of warmth to your Horseware rug during the winter months. The Horseware Liner Medium offers a 200g polyester fill, a velcro fastening at the chest and leg arches that offer increased freedom of movement and allow the rug to wrap under the horse's belly for extra warmth and protection. The Horseware Liner easily attaches to any compatible Horseware rug with the simple velcro tabs around the neck area and the clip at the back. Read more… The Horseware Liner is compatible with the Horseware Amigo Insulator Rugs excluding the All-In-One.