Union Exoframe 4.0 Ankle Strap Black

The Union Exoframe 4.0 Ankle Strap Black is a complete replacement ankle strap kit for riders who want to restore support without replacing the whole binding. This version comes in M/L for Medium and Large Union bindings. It holds the boot across the ankle area, where secure contact helps transfer movement into the binding. Choose it for a damaged strap assembly or an appropriate replacement on a compatible existing setup.

The strap uses DuPont Hytrel construction with an open structure that spreads pressure over the boot. Union rates its stiffness at 7/10, making it a supportive option within the strap range. That number describes the strap, not the flex of the complete binding. Your highback, baseplate and boot still shape the overall response. Positioning the strap correctly matters as much as tightening it, especially when finding a balance between firm contact and comfort.

The kit includes left and right ankle straps, already assembled with the working components. You receive two magnesium ratchets, two ratchet screws, two double-hinge ankle connectors and two tool-less adjusters. Replacing the assembled pair is useful when several parts of an old strap are worn. It also keeps the left and right setup consistent, rather than combining an unfamiliar buckle and connector from unrelated spare components.

The double-hinge connectors let the straps move away from the boot opening for easier entry. The tool-less adjusters allow strap length changes without reaching for a screwdriver during normal adjustment. Begin with the boot seated fully in the binding, then centre the strap across the ankle. Leave enough ladder engagement for the ratchet to work cleanly without pulling the assembly to the end of its adjustment range.

Union lists compatibility with its strap bindings from 2016 onward, subject to the correct mounting connection and size. Compare your existing attachment before fitting, particularly on a setup assembled from older spare parts. M/L refers to the binding size rather than a separate boot-size chart. After installation, check that both ratchets close, hold and release smoothly. Inspect the ladders as well as the new straps: damaged teeth elsewhere in the assembly can still affect the connection. Remove snow and grit, let the straps dry and inspect the hinge area during routine maintenance. Ask us to check your binding model if needed, or compare options in our Union range.

• Model: Exoframe 4.0 ankle strap kit; black; 17020200-BLK-005.
• Size: M/L for Medium and Large Union bindings.
• Support: 7/10 strap stiffness; DuPont Hytrel construction.
• Contents: left/right straps, magnesium ratchets, screws, double-hinge connectors and tool-less adjusters.
• Format: assembled kit with mesh carrying bag.