The F. Available. 90 Boa Inline skate is designed with the true athlete in mind. This K2 soft boot can be fine tuned to fit you perfectly while you skate; thanks to the dialed in technology that the boa closure system provides. The die-cast aluminum frame provides a stable platform for speed, with a wheelbase that is quite maneuverable, and the stability plus cuff delivers maximum support. With the F. Available. 90 Boa's 90mm wheels, and its ilq-7 bearings, you'll have everything you need to complete your fitness regimen.