Last tested
2023
Status:ongoing
2024

Arc ST

The fast-and-light binding by Spark R&D with Tesla T1 system and meticulous design.
  • Buyer’s Guide reviews
  • In words
  • Technical specifications

Buyer’s Guide reviews

Characteristics
Speed in use
Highback rigidity
Strap comfort
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The charts show our impressions from testing
Product info
Category average
Performance profile
Alpinism
Long hikes
Fun freeride
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Recommended level
Technical Level
Beginner
Intermediate
Advanced
High level
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In words

Intro
This fast-and-light model by Spark R&D is designed to keep weight to a minimum for all who love a more ambitious ascent.
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On the snow
Compared to last season, this year's model now has a stiffer, asymmetrical highback. With just the right touch of minimalism, every detail is designed to reduce weight without taking away anything essential. It maintains its strengths as one of the most popular bindings around, including the Tesla T1 binding system. The baseplate is a solid block of material with no excess. The straps, too, are minimalist. Includes integrated heel lifter under the base of the binding.
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Technical specifications

Negative highback
Yes
Heel lifter
Yes
Heel lock
No
Individual weight
656 gr
Price
529 €
Top stories
2025
Thoughts
At the heart of every ski

Editorial

2025
Intro
Test center

Where the snow is always present

2025
Intro
Skimo skins

It's not all about grip

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Instruction
Boot lab: Boots under the microscope

The laboratory analysis of flex, walkability, and thermal insulation of ski mountaineering boots

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Intro
Skimo poles
2025
Intro
Safety, a culture of doubt

Beyond the basic definition, there’s nothing as variable as snow conditions and the human psyche when under emotional stress. That's why, after purchasing the right self-rescue kit and airbag backpack, it’s paramount you do your research, train, scrutinize your decisions and, if necessary, opt for plan B. And, at least for now, don’t rely on artificial intelligence. 

2025
Race
Light
Tour
Free
Awards
Best bindings 2025

Skiaklper's Awards

2025
Intro
Products for mountaineers

Once you’ve chosen your skis, boots and bindings, your thoughts then turn to harnesses, crampons, ice axe and helmet, though perhaps not everyone, and not straight away. While it’s true that when starting out, especially for those transitioning from resort skiing who just want to start surfing some pow, the important thing is to get self-rescue equipment. It’s equally true, however, that the sport we love is a combination of two words: skiing and mountaineering.

2025
Split All Mountain
Intro
Boards, boots, and bindings for splitboarding

Materials are evolving, which is increasing the opportunities for pushing the boundaries of mountaineering splitboarding. It’s no longer just about easy tours, a few jumps and a beer. Thanks to innovative new setups and growing knowledge within the community, long ascents and steep terrain no longer intimidate.

2025
Intro
Skimo bindings

They’re probably the element of your setup that’s evolved the most and seen the most crossover between disciplines. Which is why in general lighter bindings have adapted to make allowances for the trend for opting for wider skis, with hybrid drilling patterns and a greater selection of ski brakes. But the aspect that requires most scrutiny is the height difference between the front and rear pins.

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