The Alkali CA5 roller hockey skate is a great intermediate level skate from Alkali. It"s a step up from the CA3 skate in that it offers a more advanced quarter package that includes AEPE foam with Guardshell for rigidity and 9mm Pro Spec tongue found on their higher level skates. The CA5 also includes a lighter and stronger fully extruded aircraft grade Aluminum chassis with all 80mm Labeda Millenium wheels.