Union Atlas Step On Fast in, fast out - total control. The all-new Union Atlas Step OnA(R) pairs the proven convenience of the Step OnA(R) Instant Connection(TM) System with Union&';s most trusted all-mountain platform. Step in to engage, pull the release lever and twist to exit. No straps, no fumbling, no lost minutes at the top of the run. Built on a brand-new Duraflex CB baseplate and matched to a custom Step OnA(R) highback, the Atlas Step OnA(R) delivers instant edge-to-edge response with a clean, strap-free profile. You get every benefit of auto entry without giving up the flex, feel, or legendary durability that made the Atlas a staple. Union is the only licensing partner that develops and produces its own Step OnA(R) bindings entirely in-house. Best for: Upper-intermediate to expert riders who want the speed and simplicity of Step OnA(R) with the power and precision of Union&';s flagship all-mountain binding. Overall Flex: 7/10 - Medium-Stiff Tech Specs Baseplate: Atlas Step OnA(R) Duraflex CB Highback: Atlas Step OnA(R) Duraflex CB - asymmetrical shape tuned for Step OnA(R) functionality Bushing: Hi-Flex HP EVA Heelcup: Extruded 3D Aluminum FLAD: Integrated 2-Stage - standard or +5Adeg forward lean Gas Pedal: Adjustable Disk Cover: Non-stick HP EVA, 100% waterproof closed-cell finish Hardware: Grade 8.8 Steel Disks: 4x2 Disk + Channel Disk (mounting hardware included) Weight: 750g (A 1/2 pair, size M) Boot Compatibility Step OnA(R) boots only. Compatible with all current men&';s Step OnA(R) model boots - Burton, Nitro, DC, and others. Not compatible with standard strap-in snowboard boots. Board Compatibility 4x2 and Burton Channel (ICS). Both disks are included in the box. Warranty Lifetime on baseplate and heelcup 2 years on everything else Size Chart MEN SMALL MEDIUM LARGE X-LARGE MONDO 24 - 25.5 26 - 28 28.5 - 31 31.5+ UK 5 - 6.5 7 - 9 9.5 - 12 12.5+ US MEN 6 - 7.5 8 - 10 10.5 - 13 13.5+ EURO 38 - 40.5 41 - 43 43.5 - 47 47.5+