Flexi SINCH Polar Ski Binding

Flexi Ski Bindings

Sinch is a sinch to sinch.

We introduced Sinch 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 all but sustained North Pole expeditions. Each pair comes with a pair of short, medium length ladder straps to accommodate any size boot.

  • two sets of ladder straps, 15 and 25cm
  • all replaceable parts
  • offset mountable
  • heel locators provide torsional rigidity

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 buckles

High-quality ratchet buckles are riveted to two 25mm webbing straps that attach to cam slots on the boot cage wall. The no-tool straps allow for fast and easy adjustment to your boot bulk.

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. We then field tested Hytrel on expeditions across Greenland and to both poles, a combined 1300km and 65 days, and it came up trumps. Attached using the webbing stems, we provide 2 sizes of ladder strap per pair allowing you to chop and change depending on your boot. Each front ladder strap has a lug on the end to keep it retained in the buckle making boot entry and sinching, well...a sinch!

Icetrek Flexi Sinch Straps


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 4

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

Flexi Sinch Strap Kit

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