The silicone grip seat of the ProKit Ride On Saddle Cover gives the rider perfect stability in the saddle, minimizing movement and finally making riding in the wet easy whilst protecting the saddle from the elements. The 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. Stirrup slits allow for easy access to pass stirrups through and a lower slot at the bottom on each side is designed to pass the girth straps through for added security (mono flap saddles). Fits 16" - 18" saddle.