K2 Skates - Radical 100 (Black) - Men's: This skate features a new low cut Marathon cuff and heat moldable construction for the most custom fit available in a training skate. The full White Quartz base offers a level of stability and rigidity that was once only available in race boots. Along with the new Four Hundred Longmount frame and 100mm (85A) wheels, it's perfect for long training skates and marathons. You can't get any faster without a race boot. Closure system: Standard Lace, Powerstrap, and a Ratcheting Buckle. ILQ-9 Bearings.