No need to worry about sore spots from long skating sessions either, as fitted in the Sting 5500 from Roller Derby is a memory foam liner which adapts to suit your foot, reducing stress on your feet (you\'ll thank us later for this) meaning you can concentrate on your skating. Specification: Boot: High performance, light micro-tech upper with quick wick comfort lining and memory foam fit. Colour: Black and Yellow Closure: Full lace up boot with Sting 5500 overlay Frame: RTX 6000 reinforced pro frame with adjustable toe stop and aluminium frame Wheel: 58mm Speed Urethane Bearings: Abec 7