for riders who want a very supportive boot for any style riding, plus have heel hold challenges, this is your boot. lace up outer shell gives the tensioning options traditional riders want, PLUS the internal Boa harness locks in your heel like nothing i've ever felt in any boot. add to this the harness inside is floating, which allows even more customized fit based on your arch(high or low), and any medial/lateral pressure points. lastly, the harness gives the boot an adjustable flex option; the tighter the harness the stiffer the boot gets, and vice versa. i crank the harness for high speed hard snow, and loosen it for riding pow for more flexability. best of all worlds. and, whatever Harshmellow is, it is an amazing damper in sole of boots!!!