The r3b donna is the top of the women's road range; the optimum in performance cycling shoe design; the perfect blend of comfort and light weight, fit, power transfer and aerodynamic efficiency. r3b donna is worn by professional racers and sportive enthusiasts across the globe, offering a carefully crafted blend of comfort and light weight, fit, power transfer and aerodynamic efficiency. R3b's single boa IP1 closure control is light, fast, secure, aerodynamic and comfortable - and is complemented by one sailcloth strap. The r3b donna's outsole is fully uni-directional carbon fiber - stiff for power transfer and sculpted to aid the slippery aerodynamics. It combines with the proven supportive and comfortable fiziK cycling insole with sculpted foot beds and supportive heel to ensure that every precious watt goes straight into your pedals. The r3b donna's microfiber upper is hard-wearing, light, and resilient with enough flexibility to ensure comfort for every woman 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.