About the R5B Uomo, from the Fizik website:
fi’zi:k’s range of road cycling shoes is developed in collaboration with leading professional cyclists and used to great effect by WorldTour, Olympic and World Championship riders. The best technologies, materials, R&D, testing and manufacture techniques are used to deliver you the best shoes for road riding and racing, and trickle down throughout the range to the highly accessible R5B which offers a carefully crafted blend of comfort and light weight, fit, power transfer and aerodynamic efficiency.
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.
The R5B’s Microfiber upper 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 and the reflective heel cap offers visibility on the road.
R5B Uomo weighs just 250g (size 42.5).