Fizik r4b spd sl road shoesthe r4b features volume control technology and the extended power strap for quick and easy adjustment to create the perfect fit for comfort and performance it is complemented by a combination of a single boa ip1 and micro strap closure system and injected composite sole features material microtex laser perforated outsole injected composite carbon vented closure system boa ip1 a and micro straps insole fizik cycling insole weight 254g size 43buy fizik footwear