Ledge Lounger LL-U-E-75S-CR-MS-STK-R103 7' Black Essential Square Crank Umbrella with Matte Silver Pole features an aluminum center pole and is ideal for both in-pool and on-deck use. High-quality materials, such as fiberglass ribs, sewn-in vents, and marine-grade fabrics make the Essential Umbrella resistant to wind, corrosion, rust, and warping. An essential addition to your outdoor oasis.