Flexi SINCH Polar Ski Binding

Flexi Ski Bindings

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Sinch is a sinch to sinch.

We introduced this model to offer an extreme-cold touring functionality with ease-of-use ladder straps and ratchet buckles. Tested on multiple polar outings, we back the durability on any mission you conceive.

Each pair comes with a pair of regular and long ladder straps to accommodate any size boot and a removable pull loop for easy step in.

  • all replaceable parts
  • offset mountable
  • heel locators provide torsional rigidity
  • No tool adjustments

Available in regular and wide. How to choose.

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Sinch is built on Flexi's Ultima System, a revolutionary concept in ski touring bindings. Click here for a full range of Ultima System features.

Flexi Ultima Total Exploded

Ladder straps and ratchet buckle boot harness

During our ladder strap R&D, we froze multiple materials down to -40c in an industrial test freezer and placed them under severe load; only DuPont Hytrel came out unscathed. Before launching the product we field tested Hytrel on expeditions to both poles and across Greenland, a combined 1300km and 65 days, and it came up trumps.

Flexi Sinch Straps

The boot harness cams into serrated slots in the side walls, no tools required for field adjustments. We recently added a removable pull-loop to enable easy step-in.

Flexi Sinch binding with grab loop zoom


Although Flexi Sinch comes in two widths, optional Bolsters take up any remaining play you may still have between your boots and sidewalls. Easy to install, simply release the straps in the cam slots, insert the bolster and re-engage the straps.

Icetrek Flexi Bolster x 2

Weight: 1350g / 48oz (including multi-shims, heel plates, mounting plates, cuffs, straps, buckles and fasteners)

Shipping weight: 1.75kg / 62oz

Base Plate: 6mm polyethylene

Boot Cage: aluminium

Mounting Plate: aluminium, anodised

Multi-Shim: polyethylene

Heel Plate: 14mm polyethylene

Heel Shim: 6mm polyethylene

Ladder straps: Dupont Hytrel, 15 and 25cm

Ratchet buckles: high-grade Taiwanese-made

Minimum ski waist width required: 45mm

Made in: Australia

To determine which width Sinch binding you require, measure your boot width at the Rear point (60mm from the back) and at the Mid point (200mm from the back). The sizes should fall within the given ranges.

More sizing information here

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