the rc4 boot line offers all-day control and power transfer for ambitious skiers seeking to reach the next level.developed over the previous three seasons, the fischer team integrated the game-changing boa® h+i1 system into their top-of-the-line rc4 mv performance boots.the dial system wraps the foot perfectly, is easily fined-tuned/adjusted, and provides an incredibly secure fit and all-day comfort.skier benefits dialed in. locked in. confident. optimized fit developed with fischer scan-fit® data secure and connected fit for improved power and control.details flex index: 120 last width: 26.5/100 mm weight: 2080 g (26.5)features gripwalk® sole fischer scan-fit® last 35mm velcroliner rc4 mv xtrbuckles 2 micro adjustable rc4 buckles boa® h+i1 fit system