Leather, size M. The insole crumbled when removed. Therefore, please use a different insole. The rest of the inner sole is still clean. I don't plan to include the insole in the shipment, but if you'd like it for size confirmation or anything else, please comment. Brown loafers with a back strap, comfortable to wear with rubber soles. - Color: Brown - Design: With back strap - Sole: Rubber sole Thank you for looking.