The Deelux Spark TF Snowboard boot is the standard in high end big mountain boots. Stiff enough to handle the roughest terrain with a Thermo Flex liner to be all day comfortable. The Spark TF is setting the bar very high. Features: SHELL: Dupont Surlyn highback, D Tex Membrane, Waterproof Construction Thermo Flex Custom Fit Liner FLEX: Asym Flex at 7 9 out of 10 LACING: Section Control Speed pull lacing, Velcro power strap on cuff Vibram Outsole Tech Specs: Section Control Lacing: Customize your fit with 2 simple pull cords. Upper and lower zone lacing allows you to tighten and loosen the 2 sections of the boot independently of each other to provide a fit that works for your foot. Simple on the fly. Thermo Flex Liner: Heating the liner provides you with a custom cast of your foot in to the boot. This provides more support and comfort as well as improving circulation for a warmer foot. NOTE: Heating and fitting process should only be performed by your dealer. DO NOT ATTEMPT AT HOME WITH YOUR OVEN OR HAIR DRYER.