Howard Elliott Q850-944 No Tip Block Patio Ottoman, Atlantis White The unique design allows weight to be distributed evenly keeping it from tipping like most foam ottomans. Constructed with a dense light-weight foam and then topped off by a soft, high quality foam making it sturdy yet comfortable. The cover is made of black marine grade vinyl providing durability to last seasons to come. Dimensions: 17 x 17 x 17. Fabric material: 100% polyurethane