The Salomon X Wave 9/10 seem to have a much snugger hell, and cuff. The Rossi XX and Power 21 are snugger here than the old Rossis, but are roomier than the X Waves. The Fit on these Rossis still felt a little boxy to me, where the X Waves have a nice wide forefoot/narrow heel last going. The flex of the Power 21 was similar to the maybe an X Wave 7; pretty soft. The XX also not very stiff. An X Wave 10 is more like a Rossi Race Boot.