Specifics -Microtex -Upper Material: Microtex -Closure: Boa IP1 -Footbed: Fizik Cycling Insole -Sole: carbon reinforced nylon -Cleat Compatibility: 3-hole roadStunning Fit with Top Performance The R5B is fi zi:k s most accessible road shoe, inheriting many of its features from the R1 and R3 models. The carbon-reinforced nylon outsole is not only lightweight, but also very stiff and durable. A stiff outsole is absolutely necessary to transfer the maximum amount of power to the road whilst also maintaining optimal pedaling technique. The Boa IP1 system offers a wonderfully high level of customization in terms of fit. Micro-adjustability and an on-the-fly one-hand ease of adjustment allows you infinite tweaking of fit. The tri-modal fitting relieves all pressure points, while the aircraft grade stainless steel construction means these shoes are sure to last season after season.Boa Volume Control By adjusting the volume control Boa, the shape of each shoe can be changed individually and adapted to fit snugly around the feet of any rider, enhancing comfort and ultimately performance.Carbon Reinforced Nylon The R5B s carbon reinforced Nylon outsole is stiff for power transfer and sculpted to aid aerodynamics. It combines with the proven supportive and comfortable fi zi:k Cycling Insole with sculpted footbeds and supportive heel to ensure that every precious watt goes straight into your pedals.Microfiber Material The R5B s Microfiber material is hard-wearing, light, and resilient with enough flexibility to ensure comfort for every rider s foot, but strong enough to withstand the demands of racing - without any weight penalty. The diamond-shaped laser-cut perforations help temperature management.Micro-Strap Closure In addition to the single BOA IP1-A closure control, one neatly adjusted micro-straps sit at the bottom to make sure the R5B fits snugly and securely. The heel of the R5B also comes equipped with a large reflective strip, ensuring you re visible no matter what time you re riding.fi zi:k is a racing brand It represents beauty, speed, passion; freedom for those who race against each other, race against the clock and for enthusiast cyclists around the world who identify with the feeling of The fire of competition .