The Shoes were tested in accordance with the applicable industry standards, including: ASTM F2913-11. The Slip Resistant sole is designed to help prevent slips and falls but this is not a slip - proof Shoe. Always exercise caution on slick or wet surfaces. Memory foam sockliner - DLS foam. Solid rubber Slip Resistant outside. Leather - synthetic overlays and perfs for breathability. Variable lacing system. Material: Synthetic, leather.