Ellie Shoes 4" Ankle Boots With Buckles and Chains. Upper Material:POLYURETHANE,Heel Material:ABS (Plastic) 408-Patrol, Color: BLKP, Women's US Size 6 . The letter "M" in the sizing designates "Medium Width" Shipped via USPS Priority Mail (2-3 day) or USPS Express Mail (1-2 day with signature required). All International shipments sent USPS Express Mail when available.