This Horseware Liner is an underblanket with 200g of fill, that can be attached to your outer rug to add additional weight. The liner attaches to the outer rug with velcro loop attachments around the neck area, while clips on the back corner of the outer rug prevent the liner from slipping. This simple system gives your rug superior insulation properties without the need for two separate rugs, and the liner can be easily washed at home in a domestic washing machine.