PROTECTION FROM THE ELEMENTS: Made from 100% waterproof 1200 denier polyester, strong enough to protect your boat from rain, snow, dirt, dust, tree sap, leaves, pollen, bird droppings and more. Excellent UV Protection keeps your upholstery from fading WATERPROOF INSIDE AND OUT: Reinforced, waterproof seams keep moisture out. Sewn-in air vents keep condensation from accumulating COVER STAYS IN PLACE: Our elasticized hem, sewn-in straps and buckles keep your cover in place. Great for trailer use and outdoor storage SIZED TO FIT: This pontoon cover fits pontoon boats 17'-20' Long (Beam Width Up to 110") This cover comes with straps and buckles to help keep the cover secure to your boat