The Viper packs all-mountain versatility in a straightforward design that balances comfort and control for progressive riding. Our AsymFrame highbacks and tool-free, adjustable toe ramp provide comfort, stability and enhanced board control, while a full-length EVA footbed and crash pad heel absorb vibration and impacts for a smooth ride.
Flex: 7/10
Board Compatibility: This Union binding is compatible with 2×4 and 4×4 mounting systems.
Base: Nylon/Glass
Highback: Asymframe Highbacks
ASYMFRAME highbacks are built to maximize lateral flex while maintaining heel-side contact for immediate power transmission and stability.
Straps: One Shot 3D Molded Straps
3D molded TPU straps that conform to the shape of your boot both vertically and horizontally for secure comfort.
Cushioning: Full Length Shore 40 EVA W/ Crash Pad Heel Pad
The EVA covers the whole length, and height on heel side, of the baseplate to maximize shock absorption and absorb vibration.
Ratchets: Alumalight
Die-cast aluminium ratchets that offer lightweight, hassle-free performance.
SIZE CHART
| Size | Boot Size (US) |
| S/M | 5 – 8.5 |
| M/L | 9 – 11.5 |
| XL | 12+ |












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