Merrell mens Mens Siltwater Strap Man Made Leather Walking Sandals, Navy Synthetic Leather Synthetic leather upper. Hook and loop 2 strap closure system. Lycra neoprene lining for padded comfort treated with M Select Fresh odour control Aegis. Moulded nylon arch shank. Merrell air cushion in the heel absorbs shock and adds stability with an EVA midsole for cushioning.