For the first time, Shimano is utilizing BOA dial closures instead of ratchets or velcro. The IP1 dials offer quick and accurate adjustments as well as a quick release for getting in and out of the shoes. Shimano says its Powerzone asymmetric wire guide lacing system provides a secure comfortable fit and prevents twisting of the foot under high power pedaling. Continued over from the R321 is the Surround upper - Colin Levitch / Immediate Media