Union Ultra
Mini Disk family · 2026/27
Terrain
Flex
Mid — 6 on Union's own 1–10 scale
Flex ratings are the brand’s own and do not compare across brands.
Union's Ultra Women is a light, freestyle-leaning all-mountain binding on the Asymmetrical Mini Disk. Union's own scorecard tells you where it lives: freestyle 9/10 is its top axis, all-mountain 8/10 sits just under it, and freeride 7/10 is the lowest of the four. The flex reads 6/10 on Union's own scale — mid, not stiff — and the pair weighs 1.64 kg. Read together, those numbers describe a binding built to feel the board and stay playful, not to charge hard and damp everything out.
The Ultra's character is built, not marketed. The Asymmetrical Mini Disk is a small mounting disk that leaves more of the board exposed underfoot, so more of the deck's own flex and pop reaches you — a livelier, more connected ride than a full-size disk gives. Union's exclusive Molecular Bushing, with a TPE outsole, is a suspension pad under the baseplate that flexes and rebounds to cushion landings and soak up chatter. The highback is all-new for 26/27 (S25 Duraflex ST), which sets how much the binding drives versus forgives, and the Integrated 2-Stage FLAD dials forward lean. There is no canting.
None of that makes the Ultra a charger, and Union's own freeride 7/10 — its lowest number — says as much; if your days are mostly pointing it downhill fast, the stiffer Falcor is Union's freeride-first pick. Inside the women's line the choices are clear. The men's Ultra is the same chassis and the same four Union scores, just 1.75 kg a pair against this one's 1.64 — a separate binding, not a size of it. The Juliet is the softer, more forgiving women's all-mountain option on a Camber Disk at 1.69 kg, for a rider who does not need the Ultra's freestyle edge. The Legacy is softer and surfier still for park-first days, and the Rosa is the lightest, most entry-level women's binding at 1.46 kg.
Two things to settle on the Ultra before you buy. First, mounting: the Asymmetrical Mini Disk fits 4x2 and Burton Channel boards only — it will not mount a board drilled solely for 4x4 or Burton's old 3D pattern, so check your inserts. Second, sizing follows your boot, not your weight; the women's run is S, M and L with no XL, and Union does not print a boot-size range on this page, so tell us your boot and we will confirm the size. We have not ridden the 26/27 Ultra Women — this is a read of Union's catalog and spec sheet, and because the highback is all-new this year, independent ride impressions are on the prior generation, not this one.
Will it fit your board?
The mounting disk fits 2x4, EST/Channel insert patterns.
Technology
Asymmetrical Mini Disk (S11 Duraflex ST)
A small, asymmetric mounting disk that leaves more of the board exposed underfoot. More of the deck's own flex and pop reaches you, for a livelier, more connected board feel than a full-size disk gives.
All-New Highback (S25 Duraflex ST)
A Duraflex ST highback redesigned for 26/27. It sets how much the binding drives versus forgives; Union positions it as responsive where you want it while staying playful.
Union Exclusive Molecular Bushing (w/ TPE Outsole)
A suspension bushing under the baseplate that flexes and rebounds to absorb impact underfoot, cushioning landings and soaking up chatter on rough snow. It tunes feel, not protection.
Integrated 2-Stage FLAD
A forward-lean adjuster built into the highback, so you can dial a more upright, surfy stance or a more driven one without a screwdriver.
Features
- ·Hybrid 1.0 ankle strap w/ PU Core
- ·TS 5.0 UltraGrip toe strap
- ·Pins + Quick-Lock strap adjustment
- ·Magnesium S1 ratchets with steel base
- ·Duraflex + ExtraGrip footbed
- ·Extruded 3D Aluminum heelcup
- ·Grade 8.8 steel hardware
Strengths
- +The Asymmetrical Mini Disk leaves more board underfoot, so you feel its flex and pop.
- +Union rates it freestyle 9/10, its top axis, on a light 1.64 kg pair.
- +The Molecular Bushing suspension pad cushions landings and soaks up chatter underfoot.
- +Mid 6/10 flex with a 2-Stage FLAD and an all-new 26/27 highback.
Best For
Women riders who ride all-mountain-freestyle — park, side-hits, butters and playful groomer laps — and want a light, mid-flex binding that keeps the board lively underfoot rather than damping it out, on a board with 4x2 or Burton Channel inserts.
Limitations
- −A freestyle-first binding, not a charger: Union's own freeride is 7/10, its lowest axis.
- −No canting, and Union prints no boot-size range for S, M or L.
- −The Mini Disk fits 4x2 and Channel only — it will not mount a 4x4 or Burton 3D board.
- −No independent 26/27 ride data yet — this is a catalog-and-spec read.
Not For
Riders who want a stiff, damp binding for aggressive high-speed charging or a stiff directional freeride board (the Ultra is mid 6/10 flex, freeride 7/10, and the stiffer Falcor is the freeride pick); anyone mounting a board drilled only for 4x4 or Burton's 3D pattern, since the Mini Disk will not fit it; and riders shopping for the cheapest entry-level women's binding — that is the lighter Rosa at 1.46 kg.
Sizing
Binding size follows your boot, not your weight or your height.
| Binding | US boot | EU boot |
|---|---|---|
| S | Not published by Union | Not published |
| M | Not published by Union | Not published |
| L | Not published by Union | Not published |
Specs
- Entry system
- Traditional two-strap (ankle + toe)
- Flex
- 6/10 on Union's scale
- Weight
- 1.64 kg per pair
- Mounting disk
- Asymmetrical Mini Disk (fits 4x2, Burton Channel)
- Baseplate
- S11 Duraflex ST
- Highback
- S25 Duraflex ST (all-new for 26/27)
- Heelcup
- Extruded 3D Aluminum
- Bushing
- Molecular Bushing w/ TPE Outsole
- Footbed
- Duraflex + ExtraGrip
- Forward lean
- Integrated 2-Stage FLAD
- Ankle strap
- Hybrid 1.0 w/ PU Core
- Toe strap
- TS 5.0 UltraGrip
- Strap adjust
- Pins + Quick-Lock
- Ratchets
- Magnesium S1 w/ Steel Base
- Hardware
- Grade 8.8 Steel
- Canting
- No canted footbed
- Union ratings
- All-Mountain 8 · Performance 8 · Freestyle 9 · Freeride 7 (Union's own)
- Colorways
- Black, White, Blue
Common Questions
- What is the difference between the women's Ultra and the men's Ultra?
- They are separate bindings that share the same chassis and the same four Union scores. The women's Ultra comes in lighter at 1.64 kg a pair against the men's 1.75 kg, and runs S, M and L rather than up to XL. Order the one built for your boot size.
- Will the Union Ultra Women fit my board?
- Its Asymmetrical Mini Disk fits a 4x2 insert pattern — Union labels the same holes 2x4 — or the Burton Channel. A deck drilled only for the 4x4 layout, or Burton's older 3D three-hole pattern, will not mount it. If you are not sure what your board uses, tell us and we will check.
- What size Union Ultra Women should I order?
- Size follows your boot, not your weight or height. The women's Ultra runs S, M and L, with no XL. Union does not print a boot-size range for each size on this page, so tell us your boot and we will confirm your fit.
- Does the Ultra have a release like a ski binding?
- No. A snowboard binding has no DIN and no release setting — it holds your boot to the board. Its specs describe feel and response, not protection from injury.
