Featuring an injected mesh form skin quarter package with a brushed micro-fiber liner, the JetSpeed 340 Skate will help you leave others behind with each stride QUARTER PACKAGE Injected with Mesh Form Skin. Durable outer shell with foot support and comfort. LINER Brushed Micro-Fiber. Provides comfort and a resistance to wear and tear. OUTSOLE Injected Outsole. Helps energy transfer with every stride. TONGUE Felt Tongue. 5mm felt tongue for comfort and protection. FOOTBED CCM Footbed.