The lining is made of high-quality leather

These flexible

but be careful with the straps

Comfortable sandals all day long

merrell wildwood aerosport rock 3-48960-7635 The lining is made ofStay cool and comfortable on the trails with Merrell's latest athletic shoe, designed with breathable ventilation panels and quick dry materials. The synthetic and mesh upper keeps your feet fresh, while the elastic cord and lock lacing system ensure a quick and secure fit. Enjoy flexible support with the Kinetic Fit BASE removable footbed, shock absorption with Merrells Air Cushion in the heel, and added stability from the molded nylon arch shank.