Rollerblade Men's Speedmachine SX 90 Skate Ideal for long training sessions and super smooth/fast skating Fiber Tech 3/4 high shell for an incredibly supportive fit and true performance Precision 5 Star Fit liner system comfortable and highly breathable Ratchet micro adjust upper cuff and Velcro instep buckle with performance lacing system Speedfire Aluminum 11.2" 285mm frame with racing axles Active HP 90mm/84A Wheels with SG9 Bearings