Some customers find that they need to order UP 1/2 size from their normal US size. As with all Lems shoes, if you find you need more space inside the shoe, you can remove the insoles. Upper: Suede, canvas + wool (Blackjack colorway uses vegan microfiber instead of suede) Lining: 100% polyester Outsole: 9.0mm LemsRubber™ (air-injection rubber) Insole: Ultra-thin 0.8mm cork top layer with 3.0mm PU under layer Stack Height: 10.0mm (not including 3.8mm insole) Drop: 0.0mm (Zero-Drop) Weight: 8oz (Men's 10)