for more information about the Sperry BIONIC Collection. The Sperry Crest Twin Gore Bionic slip-on sneakers have a sleek look and are made from recycled material. These slip-on shoes will have you looking good for seasons to come, while you are doing good for the planet by wearing them! Each pair of Sperry BIONIC shoes is woven from, on average, five recycled plastic bottles. Man-made upper made with BIONIC material, which is woven from, on average, 5 recycled plastic bottles. Gore panels for a more flexible yet secure fit. Heel loop for easy entry. Upper is bonded to the low-profile midsole. Breathable canvas lining for added interior comfort. Cushioned memory foam insole provides comfort and arch support. Rubber outsole in a repeating, logo cut-out for basic traction. Imported. Measurements: Weight: 11 oz Product measurements were taken using size 8.5, width M (B). Please note that measurements may vary by size. Weight of footwear is based on a single item, not a pair.