The Gumbies Corker features a real cork top layer which is naturally breathable, anti-microbial, durable, water resistant and super comfortable. With a recycled cotton canvas strap and super soft cotton toe post, the Corker provides sustainable comfort that doesn't cost the earth. All Gumbies flip flops and sandals feature their signature recycled rubber Gumtread™ outsole which is contoured to the shape of the foot for comfort with tire-like tread for grip and durability.