The Scarpa Ribelle Run Kalibra G is a winter trail running shoe designed for athletes who refuse to be confined by seasonal limitations. Engineered for mixed terrain and extreme conditions, this shoe blends mountaineering-grade protection with trail-running agility. Scarpa, a brand renowned for its alpine heritage, has taken its Ribelle Run platform and winterised it with advanced materials and technologies to create a shoe that thrives in snow, mud, and cold weather.
Design and Build Quality
At first glance, the Ribelle Run Kalibra G stands out with its futuristic silhouette. The most striking feature is the integrated gaiter, which gives the shoe a boot-like appearance. This gaiter is made from Polartec Windbloc, a three-layer fabric that is windproof, water-resistant, and thermally insulating. It wraps around the ankle and lower leg, shielding the foot from snow, rain, and debris.
The gaiter is secured with a water-repellent zip and a Velcro strap, allowing for a snug fit over winter layers or a streamlined tuck under trousers. This design ensures that the shoe remains sealed against the elements while maintaining flexibility and comfort.
Underneath the gaiter lies the BOA Fit System, a micro-adjustable dial that replaces traditional laces. The BOA system uses Dyneema laces and Wrap360 technology to provide a secure fit around both the forefoot and heel. This allows runners to make quick adjustments on the move, even with gloves on, without compromising lockdown or stability.
The upper is reinforced with a climbing-inspired TPU rand that encircles the shoe, offering abrasion resistance and structural integrity. Despite its rugged build, the Kalibra G maintains a relatively lightweight profile, making it suitable for both running and fast hiking.
Midsole and Cushioning
The midsole of the Ribelle Run Kalibra G is constructed from medium-density EVA foam, offering a balance between cushioning and responsiveness. With a stack height of 24.5mm in the heel and 20.5mm in the forefoot, the shoe features a 4mm drop that encourages a natural running gait.
A subtle rocker shape in the midsole promotes forward propulsion and increases cadence, similar to designs seen in Hoka and Scott running shoes. This geometry helps reduce fatigue over long distances and enhances efficiency on uneven terrain.
The cushioning is firm enough to protect against sharp rocks and roots, yet flexible enough to adapt to the contours of the trail. This combination makes the Kalibra G suitable for technical terrain where both comfort and control are essential.
Outsole and Traction
Scarpa equips the Kalibra G with its proprietary PRESA outsole, made from Speed Force sticky rubber. The outsole features deep 5–6mm lugs that bite into soft ground, snow, and mud with confidence. The lug pattern is designed to shed debris and maintain grip across varied surfaces.
One of the standout qualities of the PRESA rubber is its performance in cold temperatures. Unlike some compounds that harden and lose traction in freezing conditions, PRESA maintains its pliability and grip, making the Kalibra G a reliable choice for winter adventures.
The outsole also includes a climbing zone at the toe, allowing for precise foot placement on scrambles and rocky ascents. This feature adds versatility for runners who venture into alpine terrain or use the shoe for approaches.
Fit and Comfort
The Kalibra G offers a snug, performance-oriented fit with a traditional toe box shape. Internal loops make it easy to pull the shoe on, and the BOA system ensures a customised fit that can be fine-tuned throughout the run.
The internal tongue sits flush against the foot and includes a U-shaped cutout to reduce pressure on the front of the ankle. While most testers found this design comfortable, some reported minor rubbing that was resolved with simple adjustments.
The Polartec gaiter adds a layer of warmth and protection without overheating. Testers noted that even in deep snow and wet conditions, their feet remained dry and warm. The breathability of the Windbloc fabric prevents moisture build-up, making the shoe suitable for extended use in harsh environments.
Performance in Real Conditions
The Ribelle Run Kalibra G excels in winter trail running, fast hiking, and alpine approaches. Its weatherproof construction and aggressive outsole make it ideal for snowy trails, muddy paths, and rocky ridgelines.
During testing in early winter conditions, the shoe performed admirably in heavy snow, rain, and mud. The gaiter kept moisture out, while the BOA system allowed for quick adjustments without removing gloves. The TPU rand protected the shoe from abrasions, and the PRESA outsole provided reliable traction on slick surfaces.
Despite its robust build, the Kalibra G maintains the agility of a trail runner. It offers a responsive ride and stable platform, allowing runners to maintain speed and control on technical terrain. The shoe is not crampon-compatible, but its grip and protection make it suitable for most winter conditions short of mountaineering.
Durability and Longevity
Scarpa’s attention to detail and use of premium materials ensure that the Kalibra G is built to last. The TPU rand, Polartec gaiter, and PRESA outsole show minimal wear after dozens of miles in harsh conditions. The BOA system remains reliable, and the EVA midsole retains its cushioning and shape.
This durability makes the Kalibra G a worthwhile investment for runners who frequently train or race in winter environments. Its protective features reduce the need for additional gear like gaiters or waterproof socks, streamlining the kit for cold-weather outings.
Pros and Cons
Pros
- Excellent weather protection with Polartec Windbloc gaiter
- BOA Fit System allows quick, precise adjustments
- PRESA outsole offers superb traction in snow and mud
- Durable construction with TPU rand and EVA midsole
- Responsive ride with rocker geometry
- Warm and breathable for winter use
Cons
- Not compatible with crampons
- Zipper can be fiddly to adjust with cold hands
- Slight rubbing at ankle for some users
- Premium price point may deter casual runners
Who Should Buy the Scarpa Ribelle Run Kalibra G
The Scarpa Ribelle Run Kalibra G is best suited for trail runners, fastpackers, and mountain athletes who train year-round and demand high performance in winter conditions. It’s ideal for those who run in snow, mud, and rain, and who value protection, traction, and adjustability.
Casual runners or those in mild climates may find the shoe’s features excessive for their needs. However, for serious winter athletes, the Kalibra G offers a unique combination of comfort, durability, and technical capability.
Final Verdict
Scarpa’s Ribelle Run Kalibra G is a standout winter trail shoe that bridges the gap between mountaineering boots and trail runners. With its integrated gaiter, BOA Fit System, and PRESA outsole, it delivers exceptional performance in cold, wet, and technical environments.
While it comes at a premium price, the Kalibra G justifies its cost with thoughtful design, reliable protection, and long-lasting durability. For runners who embrace winter and seek a shoe that can keep up with their ambitions, the Kalibra G is a top-tier choice.
