Ski Mountaineering Footwear


As low as €691.90
Synchro is the La Sportiva ski boot dedicated to free-ride ski mountaineering. It combines power, resistance and precision comparable to a ski boot for downhill skiing, with the lightness and mobility of a ski boot of new generation mountaineering.
color: Ocean/Lava
Size Chart

This product is out of stock.


The Synchro structure allows you to fully enjoy the descents on powder snow relying on the perfect transmission of power and control over the skis, accentuated by the use of safety TR2 bindings (fully compatible with this model). The lightweight Grilamid shell is flexible and resistant while the patented Vertebra Technology ™ locking system loaded carbon is part of the boot structure. The perfect transmission of power is accentuated by the Booster Dynamic Power Strap®, a highly resistance elastic strap that allows flexibility and shock/vibration absorption between the shell and the skier's leg, and the innovative hinged Double Power Tongue ™ consisting in two overlapping parts which, in ski mode, confer structural rigidity for the descent and in walk mode, facilitate the stride by increasing mobility and flex qualities. The new Buckle Pegasus Plus ™ locking system consists of 4 tough, precise buckles that allow perfect adjustment of volumes thanks to the Backbone Control micro regulation settings in a compact, functional design, created to facilitate opening / closing while containing the overall volume of the boot. Synchro: free-ride at maximum power

tech info

La Sportiva

The heel block is compatible with the Trab TR2 binding thanks to the lateral slots created to lodge for the TR2 system’s metal “teeth”, a solution that allows for greater stability while skiing guaranteeing greater movement control and greater safety in the transmission of power to the ski.
The heel is equipped with two La Sportiva hooks perfectly compatible with the Tech bindings without further adjustment.

Carbon Reinforced Grilamid®
PEBAX® Rnew® bio-based
Buckle Closures:
4 + Booster Dynamic Power Strap®
Range of motion:
25 - 31½ (mondo point in half sizes)
Binding compatibility:
Tech, AT, Skitrab TR2
1480 g (½ pair, sire 27.5)


+ G-Shell - super compact: only 303 mm in length, size 27.5. The lightweight, Grilamid ski boot is reduced in thickness and weight without compromising the overall performance. The cuff offers freedom of movement and the innovative Rear Diffuser ensures greater stability and security of the ankle when the shell is closed in the forward position.
+ The Dual-Axis Cuff ™ consists of two synergic elements: 1) a Pebax double density hood and Climbing System Control ™ double hook which provides control of lateral stability and increases the range of motion of the ankle in the uphill phase, 2) the Vertebra Technology ™ patented locking system loaded carbon: a structural part of the boot, facilitates the transmission of downhill power thanks to the exceptional flex. The addition of an asymmetrical rear spoiler allows to fine tune the boot and the position of the foot in the shell.
+ Walking Profile: the bi-axial leg portion provides 60 ° range of motion and the configuration of the shell in line with the ISO 9523: 2008 (DIN Touring) make the boot compatible with the AT binding system, TECH mini bindings and safety Skitrab TR2 bindings. The 17mm ramp-angle provides comfortable fit even during long periods of use.
+ Shell Line: stiffening line defined through the structural analysis of 3D models to contain the deformation of the shell.
+ Double Power Tongue™: patented PEBAX® Rnew® bio-based tongue in two parts that overlap in ski mode to confer structural rigidity for the descent and in walk mode, facilitate the walk by increasing the mobility and flex.
+ 4BT Tech Last™: the neutral form with an internal width of 102.5 mm, keeps the foot in a comfortable position to deal with very technical terrain. Similar to the form used on Spitfire, Sideral and Starlet but wider for greater comfort in the front section and in correspondence of the fifth metatarsal.
+ WarmSole™ Insert: insulating polyurethane, removable sock liner: avoids direct contact of the foot with the shell, increasing the thermal insulation qualities of the boot and the fact of making it the warmest 4 buckle boot on the market.
+ Pegasus Buckle Plus™ (patented): aluminium buckle with micro Backbone Control settings with a compact and functional designed created for easy opening/closing operations even with gloves and to contain the total volume of the boot.
+ Booster Dynamic Power Strap®, high resistance elastic Velcro band that allows flexibility and shock absorption between the shell and the skier's leg for perfect transmission of power.
+ Vertebra Technology™: Vertebra in Grilamid® loaded carbon. It makes up the structural part of the cuff and ensures maximum safety and precision in “Downhill mode” re leasing power from the leg to the cuff and ski for decisive and powerful downhill slopes.
+ Ski/Walk: rapid closure system for transit from ski to walk mode in one quick motion: patented.
+ Regulation system applied to the vertebrae: allows you to adjust the angle of the cuff on 3 positions: 10°, 14°, 18°.
+ Vibram® Outsole™: Dual density Vibram outsole with soft inserts 85 shore in the toe and heel for easy climbing on technical passages. Centering system with spacer that allows quick and easy boot to ski attachment.
+ Binding compatibility: TECH race mini bindings, AT bindings and exclusive compatibility with safety Skitrab TR2 bindings for which it is sufficient to remove two metal parts with the key supplied.
+ EZ Wrap Liners – preshaped liner moulded on the last of the shell, provides immediate comfort. The liner can be thermo-moulded for further customization of the fit. Closing overlap for maximum comfort and support during descent.

shipping time and returns policy

In general, shipments to Italy are delivered within 2/3 working days.

Shipments to the rest of the European Union take approximately 2/5 working days.

Shipments to the rest of the world take approximately 7/8 working days (not accounting for customs delays).

If you change your mind, you can return your items within 14 days of delivery.

  1. Returned products must be unworn, unwashed and unaltered.
  2. No refunds or exchanges are possible for customized products.
  3. Returned products must have all the original tags and labels attached and be in their original and integral packaging, including La Sportiva box, which is not to be used as shipping packaging.

In case of return, the shipping costs and any customs duties are charged to the customer.

For more information, consult the customer care area.

For the items Stratos Mask and Stratos Mask Filters is not possible to proceed with the return request.

shipping costs and payment methods

The shipping for CE countries is free for all orders over € 180. In case of return the shipping costs will be at your charge, you can ship back with any courier or postal service that has a tracking number.

Estimates of shipping costs are indicated in the customer area, which may vary depending on the weight of the box.

The final price will be displayed in the cart before making the payment.

Inside the European Union

There are no additional costs or duties on products marketed in countries within the European Union. Customers will not have to pay anything on delivery.

Outside the European Union (Great Britain, Switzerland...)

Shipments to destinations outside the European Union are subject to import taxes or customs duties. These charges are the sole responsibility of the recipient, who will have to pay the amount due to the forwarder or to the competent authorities. We are not responsible for customs duties, which are the responsibility of the customer.

Our online store accepts payments via:

  1. PayPal,
  2. Credit Card,
  3. Bank Transfer,
  4. Amazon Pay

You may select from these payment methods at the end of the order process.

All payments will be remitted to who manages the online sales operations of the La Sportiva online store.