ALKALI RPD Quantum + Roller Hockey Skate features ultra light quarter construction with additional stiffness, 100% heat moldability, increased energy return and improved impact resistance. Alkali Pro+ roller last for a wider last as well as increased width & comfort. Comfort Edge upper ankle pads. Flexible tendon guard for maximum range of motion and proper stride extension. Maximum Power Transfer outsole with low profile wheel channels. Strategically located wear patches. Actvwick Hydrophobic anti-slip moisture wicking internal liner. Perforated Pro Tongue. HD thermoformable lace bite tongue insert. Movement Stamped Extruded Chassis provides a quicker turning radius, greater balance, and an increased power transfer. Labeda Union Wheels. ABEC 9 608 bearings.