These clogs are a closed cell resin which is anti-microbial by nature and resists odor, making these perfect barefoot shoes. A combination of material and design makes the shoe slip resistant. Strategically placed ventilation holes allow water, sand and air to travel through the footwear. Heel strap can be rolled forward for a slip on clog shoe or keep it back for a heel strap. Arch support is built in, making these all day shoes. Non marking outsole.