Made with polyester outer and lining, with fibrefill; Incorporating the Optimo Split technology this liner is suitable for all Optimo rugs with the liner symbol; A simple system, Horseware liners give your rug superior insulation properties without the need for 2 rugs; The liner attaches by Velcro loops to the neck area of the outer rug, and clips onto the back corners to prevent the liner from slipping; Liners can be easily washed in a domestic washing machine