This is the nicest skate rollerski boot we know to exist in the market. Lots of carbon fiber, lightweight, great breathing. Adjustable canting at the ankles. Comfortable cuff and really nice BOA lacing to get the right tightness. Fit runs on the more narrow side for the Ultimate, verse the other models from Spine are wider. They ship with a half size volume reducer you can insert. This model runs more narrow than the Alpina ESK 2.0 rollerski boots, but same length.
Inside length of the Ultimate model measured by us with tape measure: