LeMieux ProKit saddle cover is made of a durable, waterproof polyester outer with a soft fleece lining to protect the saddle. Waterproof rating of 3000mm. The adjustable elastic drawstring allows it to fit most shapes and sizes of GP and Jump saddles for a snug fit, while the over sleeve allows you to keep your girth secure on top of the cover to keep your saddle clean. A lower slot at the bottom on each side is designed to pass the girth straps through (mono flap saddles) for added security.