Brand New Pair of Propet’s Max Strap Casual Shoes. The Max is the lace version of the Max Strap. It also has a long-lasting antimicrobial PU foam insole with a gel heal insert for shoe functionality and extreme comfort! Available Sizes: 7-12, 13, 14, 15 in varying sizes. Available Widths: Medium, Extra Wide, Extra Extra Wide. Manufacturer Part Number: MF023.