The contoured sole ensures that your feet are properly supported from heel to toe. The result is a natural rolling motion of the foot, which significantly reduces fatigue when walking. The Birkenstock Men's Arizona Birko-Flor Sandals are made with two straps and a comfortable design. The upper is made of easy-to-care Birko-Flor, which has been lined on the inside with a soft, breathable layer of fleece. This high-quality material is gentle on the skin and can be worn for long periods of time without discomfort. The sandals also feature an EVA sole, which is a high-quality, elastic material that cushions the feet and reduces fatigue when walking.