This is an Aggressive Rollerblade solo boot with UFS frames. This skate can be used as an aggressive or fitness skate. The universal frame system (UFS) allows you to put any aggressive frame on this boot or put this frame on any other aggressive skate. The skate is very well designed with an amazing shock absorber and great liners. The skate comes with small soul plates but can be easily replaced with the Rollerblade SOLO souls. Due to the flat and narrow base this skate can fit other flat aggressive soul plates but it will require customization. Features: Rollerblade Solo Aggressive boot Extremely light boot Rollerblade Fusion Liners Rubber shock absorbers UFS Aluminum frame 90MM 84A wheels 16 SG 9 bearings Description from Rollerblade: We've taken our experience building both molded and soft skates and blended together the benefits of both to bring you the fusion urban skates. Unique molded shell maximizes performance, stability and durability without being heavy. vented shell and specialized fit liner ensure comfort and breathability. Shock absorber in the heel minimizes impact. Ideal for urban adventures, the fusion's ufs 243mm alu frame and 80 mm wheels are designed for controlled maneuverability. Offers replaceable components and removable, optional sole plates for versatility.