The liner attaches simply and easily to the neck loop and extra fillet D ring on your fly rug. It is suspended from the outer rug and does not slip. Its shallow depth helps keep air circulating around the horse. The high tenacity nylon, waterproof and breathable outer is white to reflect the sunlight, an absorbent middle layer transfers moisture away from the horse and the super smooth nylon lining will polish the horse's coat and prevent rubbing. Only this year's rugs have the attachments for the liner.