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STR
STR
STR
STR
Model Information

STR

Built To Charge

Ride the entire mountain without breaking the bank. The STR is the perfect intro to Union's All-Mountain binding category.

$219.95
$219.95
$219.95
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Shipping calculated at checkout.
S M L
Size Chart

Find My Size | Based on Men's' Size Chart .arrow icon union

US
EURO
UK
MONDO
6-7.5
8-10
10.5+
24-25.5
26-28
28.5+
5-6.5
7-9
9.5+
38-40.5
41-43
43.5+
4-6.5
7-8.5
9-11
21-23.5
24-25.5
26-28
2-4.5
5-6.5
7-9
34-37
38-40.5
41-43
11C-3
3-5.5
6-7.5
17.5-21
21-23.5
24-25.5
10K-2
2-4.5
5-6.5
28-34
34-37
38-40.5
Your Size Is XS S M L
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Main Information

STR

Ride the entire mountain without breaking the bank. The STR is the perfect intro to Union's All-Mountain binding category. A responsive Stage 5 Duraflex baseplate, paired with the supportive S11 Duraflex highback, and super durable Exoframe 2.0 ankle strap, will keep you feeling locked in and ready to power through whatever the mountain can throw at you.

warranty union
THE UNION WARRANTY
LIFETIME FOR BASEPLATE / HEELCUP.
1 YEAR FOR EVERYTHING ELSE.
Binding Performance
Freestyle Rating: Freestyle bindings are designed for riders looking for the ultimate freedom, comfort and that “loose truck” feel. These bindings are generally best suited for riding park or riders looking for a more soft and surfy board feel.

All-Mountain Rating: All-Mountain bindings are generally mid-flexing and built to handle all terrain and all riding styles.

Freeride Rating: Freeride bindings are usually stiffer, provide instant edge-to-edge response, and the most stable board connection possible. Freeride bindings are generally best suited for high speed carving or ridding steep technical terrain.
freestyle
Freestyle
Good
Great
freestyle
All-Mountain
Good
Great
freestyle
Freeride
Good
Great
Binding Flex
Union Bindings come in a verity of flex ratings. The baseplate, highback, straps, bushing and disk all have different stiffnesses to help give a specific ride feel and function. Softer flexing bindings are generally used for more surfy or freestyle riding, while stiffer bindings are generally used for more hard charging and responsive freeriding.

Overall Flex

6/10

Flexy
Rigid
Specifications

Key Features

STR
exoframe bindings

Stage 5 Duraflex Baseplate

All day comfort and response for riding the entire mountain. The bombproof Stage 5 Duraflex baseplate is built to last. Backed by a lifetime warranty.

Baseplate Flex

Flexy
Rigid
exoframe bindings

S11 Duraflex Highback

The perfect blend of flex and response for riding the entire mountain. The S11 Duraflex highback is ideal for beginner to intermediate riders looking to up their game.

Highback Flex

Flexy
Rigid
exoframe bindings

Exoframe 2.0 Ankle Strap

Exframe 2.0 ankle straps provide a secure and locked in ride feel. Lightweight, super durable and a team and shop favorite.

Anklestrap Flex

Flexy
Rigid

TS 4.0+ Toe Strap

The all-new TS 4.0+ toe strap keeps you locked in for the ride down without letting you know it’s there. A new shorter buckle base helps to reduce weight and pressure points. Easily adjust to any boot with the quick snap of the pin adjustment, no tools needed.

Magnesium S1 Ratchets

The all-new Magnesium S1 ratchets are Union’s answer to the elements. A fully integrated spring protected from the harsh outside provides you with Union’s best ratchet to date. Longer life span and better spring return guaranteed.

Forged Carbon Gas Pedal

The Atlas FC's Forged Carbon gas pedal provides instant edge-to-edge response for charging the most technical lines and powering through hard carves. Extremely lightweight and only available from Union Binding Company.

B4BC

Sales: 2% Per B4BC Binding Sold is Donated Back to Boarding For Breast Cancer.

Split flad 2.0

Fast and easy. Quickly switch from touring mode to ride mode in the blink of an eye. The new Explorer Split Forward Lean Adjuster (FLAD for short) has been upgraded for improved durability and easier transition with gloves.

Specifications

Binding Details

Technology
Baseplate
Stage 5 Duraflex
All day comfort and response for riding the entire mountain.
Bushing
EXT Thermoformed EVA
Shock absorbing EVA padding saves your heels and promotes a true and even board flex.
Heelcup
Extruded 3D Aluminum
Designed for optimum heel hold and minimization of drag. Lifetime warranty.
Highback
NEW S11 Duraflex
Comfortable, responsive and ready to carve up the mountain.
Ankle Strap
Exoframe 2.0
Lightweight, super durable and provide a locked in ride feel.
Toe Strap
TS 1.0 Hexgrip
Multi-Positional options, thermoplastic anti-slip material and fits to any boot.
Ratchet
Aluminum
Fast in, fast out - Union aluminum ratchets are easy to use and made to stand the test of time.
FLAD
Tool-Less
Quickly adjust your forward lean angle to suit the terrain in front of you.
Hardware
Grade 8.8 Steel
The strongest steel available on the market.
Strap Adjustment
Traditional
Easily Adjust With A #3 Screw Driver
Canting
Yes
3º
Suggested Board to Binding Flex
Boards and bindings come in a variety of stiffnesses for different types of riding. Every rider has their own preference on how a board and binding should interact. Below is Union's suggestion of board to binding flex.
suggested board bindings suggested board bindings
Soft
Stiff
Disk Type and Compatibility
disk bindings

Camber Disk

disk bindings

4x4

disk bindings

4x2

disk bindings

Channel

Product Video

Union Exclusive Test Environment

Technological Innovations

Union Exclusive Test Environment
Union Headquarters is located a quick 45 minute drive from the closest gondola. Living and working in the heart of the Italian Alps gives us the opportunity to test in the morning, be back in the office by lunch, adjust / modify designs by the end of the day.

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BINDING COMPARE
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MEN’S BINDINGS - X-SMALL SMALL MEDIUM LARGE X-LARGE
US Men - * - 5.5 5.5 - 7.5 8 - 10 10.5 - 13 13 - 15
US Women - 4 - 6.5 6.5 - 8.5 9 - 11 - -
US Youth - 3K - 5.5K 5.5K+ - - -
UK - 2 - 4.5 4.5 - 6.5 7 - 9 9.5 - 12 12 - 14
EURO - 34 - 37 37 - 40.5 41 - 43 43.5 - 46 46 - 48
MONDO - 21 - 23.5 23.5 - 25.5 26 - 28 28.5 - 31 31 - 33
WOMEN’S BINDINGS - SMALL MEDIUM LARGE - -
US Men - * - 5.5 5.5 - 7.5 8 - 10 - -
US Women - 4 - 6.5 6.5 - 8.5 9 - 11 - -
US Youth - 3K - 5.5K 5.5K+ - - -
UK - 2 - 4.5 4.5 - 6.5 7 - 9 - -
EURO - 34 - 37 37 - 40.5 41 - 43 - -
MONDO - 21 - 23.5 23.5 - 25.5 26 - 28 - -
YOUTH BINDINGS MINI SMALL MEDIUM - - -
US Men - * - 5.5 5.5 - 7.5 - - -
US Women * - 4 4 - 6.5 6.5 - 8.5 - - -
US Youth 11C - 3K 3K - 5.5K 5.5K+ - - -
UK 10K - 2 2 - 4.5 4.5 - 6.5 - - -
EURO 28 - 34 34 - 37 37 - 40.5 - - -
MONDO 17.5 - 21 21 - 23.5 23.5 - 25.5 - - -
CROSSOVER SIZING
BUY NOW
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BINDING FINDER
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01. General Info:

Men
Women
Youth

Find My Size | Based on 's' Size Chart .arrow icon union

US
EURO
UK
MONDO
6-7.5
8-10
10.5+
24-25.5
26-28
28.5+
5-6.5
7-9
9.5+
38-40.5
41-43
43.5+
4-6.5
7-8.5
9-11
21-23.5
24-25.5
26-28
2-4.5
5-6.5
7-9
34-37
38-40.5
41-43
11C-3
3-5.5
6-7.5
17.5-21
21-23.5
24-25.5
10K-2
2-4.5
5-6.5
28-34
34-37
38-40.5
Your Size Is XS S M L

02. Riding Ability:

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union bindings finderunion bindings finderINTERMEDIATE
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03. Riding Style:

FREERIDE
Steep, Deep, Hard Charging
ALL MOUNTAIN / FREESTYLE
Soft and surfy carving
ALL MOUNTAIN
Ride any terrain
STREET / JIBBING
Maximum freestyle flex
ALL MOUNTAIN / FREERIDE
Destroy the resort
CARVING / BOARDERCROSS
Instant edge-to-edge response
FREESTYLE / PARK
Jumps, rails, and pipe
SPLITBOARDING
Climb Up, Ride Down

04. Our Recommendation:

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UNION BINDING CO. 2022/23
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