The fizik r4b features volume control technology and the extended power strap for quick and easy adjustment to create the perfect fit for comfort and performance once you are happy with the position of the lower straps you can use the ip1 boa to customize the fit precisely and its easy to adjust on the go great for last minute adjustments for that big moment in a race the microtex upper is lighter and more durable than leather and its easy to clean so your shoes will stay looking f