Get rolling on the women's Roller Derby Super Sport SS-900 skates. The SS-900 is crafted around a tough, lightweight aluminum frame with a semi-soft memory foam liner. The soft boot's lightweight, breathable design is not only comfortable, but gives you added support from the hard shell. Fit-wise, the skate boasts a cam lever buckle with a power strap, so you can make easy adjustments while skating. And the SS-900 owes its performance to its 84mm Race Formula urethane wheels and Bevo ABEC-9 racing bearings. The SS-900 includes a heel braking system.