Skyway Sigma Vertical 22-inch Expandable Carry-On Case - Red Constructed of water and tear resistant Polyester Fabric. The fabric is designed to provide high durability and long lasting beauty. 'Zero Gravity' construction provides a frame that is stronger and 33 lighter than conventional metal frames. This provides a case with uncompromised strength. In line skate wheel for smooth long life. Expands 3.5 for extra packing capacity. Lock uplock down handle system operates with push button ease.