Part of the Athletic Collection, the Barafu offers brilliant support and comfort in a shoe that can handle the workout. The upper is made from synthetic leather and mesh, while the sockliner features MBT Dry and Cool. The lining is made from a neoprene textile.The mesh is a lightweight, woven fabric that is highly breathable. The MBT Dry and Cool is a breathable and open fabric that allows greater breathability.MBT"s have been designed to stimulate the postural and stabilising musculature of the whole body. Revolutionary sole construction utilising the interplay of the Shank, PU midsole and Masai Sensor places the body in a natural instability that can otherwise only be achieved by walking barefoot on natural, uneven surfaces. The natural instability activates the body"s supporting muscle system and has positive effects on the entire body.The positive effects of wearing MBTs includes significantly improving your gait and posture whilst relieving stress in your joints and back. Additionally they exercise a large number of muscles, whether you"re walking or standing. This in turn, stimulates your metabolism, burns extra calories and supports muscle regeneration.In regard to Instability, MBT have a four-part index (Activate, Dynamic, Performance and Ultimate) that provides differing levels of instability support, so you can find the best one that suits you. This sandal falls into Performance. There is a strong sole curve, medium midsole height, strong balancing area and a sensor with lateral and medial heel clip for increased instability.