Union Astra Step On®

Binding Flex

6/10

THE UNION WARRANTY Lifetime for baseplate / heelcup,
1 year for everything else.

KEY FEATURES

S1 Step On® W Duraflex ST Highback

The S1 Step On® W Duraflex ST Highback combines legendary Union performance with the easy-to-use Step On® Instant Connection™ System. Equipped with two stages of forward lean, you can easily dial in the highback to suit your preferred riding style.

Step On Instant Connection™ System

Fast in, fast out. The Step On® Instant Connection™ System is the only automatic binding system that meets Union's standards of performance, durability, comfort, and function. Simply step into the binding heel-first to engage the heel clip, then press down on your toes until you hear the clicks. When it's time to get out, pull the lever on the heel of the binding and twist your foot. It's that easy.

Non-Stick HP EVA Footbed

The next evolution of Union's non-stick EVA technology. Non-Stick Hot Press EVA creates a closed-cell, 100% waterproof surface that prevents snow and ice buildup underfoot. Designed to absorb vibration and cushion impacts, it delivers a smoother ride with lasting comfort. Easily adjusts for the perfect fit with your boots.

Step On Instant Connection™ System

Fast in, fast out. The Step On® Instant Connection™ System is the only automatic binding system that meets Union's standards of performance, durability, comfort, and function. Simply step into the binding heel-first to engage the heel clip, then press down on your toes until you hear the clicks. When it's time to get out, pull the lever on the heel of the binding and twist your foot. It's that easy.

Hi-Flex EVA Bushing

Hi-Flex EVA bushings act as an additional layer of dampening and shock absorption between you and your snowboard and never loose shape over time. Your knees and feet will thank you.

S1 Step On® W Duraflex ST Baseplate

Union strength and dependability + the easy-to-use performance of the Step On® Instant Connection™ System. The engineering team at Union has spent countless hours perfecting the S1 Step On® W Duraflex ST Baseplate. Backed by Union's lifetime warranty guarantee.

Specifications

Binding Details

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.

BINDING COMPATIBILITY 

Step On® 4x2 Disk + Washer

4x2

Step On® Channel Disk

Channel

 

SIZE CHART 

MEN'S	-	-	-	SMALL	MEDIUM	LARGE	X-LARGE
US Men's Boot Size	-	-	-	6 - 8	8.5 - 10.5	11 - 13	14 - 15
UK Boot Size	-	-	-	5 - 7	7.5 - 9.5	10 - 12	13 - 14
CM Boot Size	-	-	-	24 - 26	26.5 - 28.5	29 - 31	32 - 33
EU Boot Size	-	-	-	38 - 41	41.5 - 43.5	44 - 46	47 - 48
Mondo Boot Size	-	-	-	240 - 260	265 - 285	290 - 310	320 - 330

WOMEN'S	-	-	-	SMALL	MEDIUM	LARGE	-
US Women's Boot Size	-	-	-	5 - 6	6.5 - 8.5	9 - 11	-
UK Boot Size	-	-	-	3 - 4	4.5 - 6.5	7 - 9	-
CM Boot Size	-	-	-	22 - 23	23.5 - 25.5	26 - 28	-
EU Boot Size	-	-	-	35 - 36.5	37 - 40.5	41 - 43	-
Mondo Boot Size	-	-	-	220 - 230	235 - 255	260 - 280	-

STEP ON® bindings are ONLY compatible with STEP ON® boots. Do not use either product with non-STEP ON® boots or non-STEP ON® bindings. Consult the size chart to ensure that you have the correct size binding for your boot size. Pairing incompatible size boots with bindings may lead to malfunction and could compromise your safety. Women’s and Men’s sizing are based on different size standards. Combining men’s and women’s STEP ON® products will result in malfunction and could compromise your safety.

FAQs

What boots are Union Step On® bindings compatible with?