Stage IV Duraflex ST Baseplate – A stiff base combined with dual density injected bushings, provides high performance response, comfortable dampening and a true board flex. Completely indestructible.

Thermoformed EVA Bushing – Shock absorption saves your heels and promotes a true and even board flex.

Universal Disks – Compatible with 4x4, 4x2 and Channel systems.

Force Highback – Flex and tweakability where you want it, support and durability where you need it. These highbacks give you next level heelside response and board control.

SonicFuse Straps – Features a multi-layer composite strap core that is fused together to form a single, articulated strap. This minimization of stitching increases the straps durability and reduces weight. Additionally, it evenly distributes pressure across your boot improving comfort and lateral mobility.

Injected Magnesium Buckles – This high-tech process produces a material four-times the strength of aluminum with only half the weight. Plus, magnesium is easily recycled and remains the eighth most abundant material on the planet.

Extruded 3D Aluminum Heelcup – Made of extremely durable extruded aluminium, designed to minimize toe drag while optimizing heel hold.

Grade 8.8 Hardware – The most commonly used hardware is made from "mild steel" that has a property class of only 4.6. Considering how much stress a binding is under, Union uses only the strongest steel on ALL hardware.

Tool-Free Adjustments – No screwdrivers needed - Flip the levers for a quick and easy on-hill adjustment.

Union offers a lifetime warranty on baseplates and heelcups. If you break, or even crack your baseplate or heelcup during riding, they'll replace it for life. Guaranteed. All other parts are covered for 1 year from date of purchase.