The Rossignol Vizion 4B 100 HV is a medium volume, medium flex boot that is easy to get in and out of thanks to an innovative overlap shell design that allows the boot to open up wider than your average ski boot. This new Spine Link Mechanism releases to open the boot nice and wide for a hands free entry or exit, but when locked will hold the boot in its normal position. This boots Dual Core technology supplies targeted power transmission and shell wrapping to give this boot an energetic and responsive feel while the medium-volume fit of 100mm provides a balance of comfort and control.