The Slap II is a Boy's Performance Sandal that is comfortable and features a Synthetic Nubuck Upper Jersey Lining with High Frequency Welded Accent and Logo. Also has a Soft Compression Molded EVA Footbed with Anatomically Correct Arch Support and a Durable, High Density Rubber Outsole. The First 4 Sizes come with an optional Synthetic Back Strap.