The Union Astra Step On® is a women’s snowboard binding built for riders who want the speed and simplicity of Step On® entry with a more performance-focused all-mountain feel. Designed around the Step On® Instant Connection™ System, it delivers fast entry, fast exit, and a direct connection that keeps response and control at the center of the ride.
This model sits in a versatile category, with a stated 6/10 flex that balances support and mobility across changing terrain. That makes it a strong option for riders moving between groomers, side hits, resort laps, and mixed all-mountain conditions, where reliable board feel matters as much as convenience. Union positions it for freestyle, all mountain, performance, and freeride use, giving it broad range without pushing it into an overly rigid or overly soft setup.
At the core of the binding is the S1 Step On® W Duraflex ST Baseplate, paired with an Extruded 3D Aluminum heelcup and matching S1 Step On® W Duraflex ST highback. This construction is intended to combine Union’s known durability and dependable chassis feel with the locked-in function of the Step On® platform. The Hi-Flex HP EVA bushing helps keep the ride smoother underfoot, while the Non-Stick HP EVA gas pedal and adjustable gas pedal support fit tuning and board contact.
Fine adjustments are built in where they matter. The binding features adjustable forward lean through an Integrated 2-Stage FLAD, allowing riders to shift response and stance feel to suit personal preference. Hardware is specified as Grade 8.8 Steel, and the binding is listed with no canting. Total weight is stated at 1.60 kg.
Compatibility is clearly defined. The Astra Step On® uses a Step On® 4×2 Disk + Washer and is also compatible with a Step On® Channel Disk, covering 4×2 and Channel board mounting patterns. As noted by Union, Step On® bindings are only compatible with Step On® boots.
For riders prioritising clean entry, precise board connection, and a medium-flex platform for daily resort use, the Astra Step On® offers a focused, modern binding package with Union’s own Step On® execution.
- Category, Women’s snowboard binding
- System, Step On® Instant Connection™ System
- Flex, 6/10
- Weight, 1.60 kg
- Baseplate, S1 Step On® W Duraflex ST
- Bushing, Hi-Flex HP EVA
- Heelcup, Extruded 3D Aluminum
- Highback, S1 Step On® W Duraflex ST
- FLAD, Integrated 2-Stage
- Hardware, Grade 8.8 Steel
- Gas Pedal, Non-Stick HP EVA, adjustable
- Forward Lean, adjustable
- Canting, No
- Disk, Step On® 4×2 Disk + Washer, Step On® Channel Disk
- Compatibility, 4×2, Channel
- Sizes, S, M, L
- Color, Black
- Warranty, Lifetime for baseplate and heelcup, 2 years for everything else
- Important, Only compatible with Step On® boots
Snowboard binding size guide
| Binding size | Snowboard boot size (EU) |
|---|---|
| M | 37–40.5 |
Use compatible Step On® boots for the same rider category and the exact binding size range shown below.
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