Alpine Touring (AT) / Backcountry Skis

What it means

The primary intended use and design category of the ski, which dictates its overall geometry, flex, and feature set.

In practice

AT skis are classified as the 'touring' type, designed specifically for uphill travel with compatible binding mounts and weight-optimized construction. Some models blur the line with freeride skis, but the touring designation indicates purpose-built backcountry design.

Compared to other types

Unlike all-mountain or freeride skis that prioritize only downhill performance, touring skis are engineered for the complete up-and-down cycle. They sacrifice some downhill dampening and stability for significantly better uphill behavior.

What it means

The total length of the ski from tip to tail, measured in centimeters. Affects stability, turn radius, and maneuverability.

In practice

AT ski length follows similar sizing principles to resort skis but some skiers go slightly shorter (2–5 cm) to reduce swing weight and improve maneuverability in tight terrain like trees and chutes. Typical lengths range from 160cm for smaller skiers and ski mountaineering to 185cm for larger skiers in open terrain.

Compared to other types

AT skis are often sized 2–5 cm shorter than equivalent resort skis to save weight and improve maneuverability in technical terrain. Freeride skis are typically sized longer for maximum flotation and stability.

What it means

The width of the ski at its narrowest point (underfoot), measured in millimeters. The single most important geometry measurement that determines terrain suitability.

In practice

The 95–105mm range is the sweet spot for most backcountry skiers, providing enough flotation for soft snow while remaining manageable on firm windboard and crust. Ski mountaineers may go as narrow as 85mm for firm snow efficiency, while powder-focused backcountry skiers may prefer 105–115mm.

Compared to other types

AT skis are typically wider than frontside skis (63–75mm) and similar to or slightly narrower than dedicated freeride skis (105–120mm). The 85–110mm range covers the backcountry spectrum from ski mountaineering to powder touring.

What it means

The width of the ski at its widest point near the tip, measured in millimeters. Works with waist width to determine the ski's sidecut and floatation characteristics.

In practice

AT skis feature wider tips to aid flotation in untracked snow and ease turn initiation in variable conditions. Tip widths typically range from 118mm on narrower ski mountaineering models to 145mm on wide powder touring skis.

Compared to other types

AT ski tips are wider than frontside and all-mountain skis (100–120mm) but may be slightly narrower than dedicated freeride skis (130–155mm) to save weight.

What it means

The width of the ski at its widest point near the tail, measured in millimeters. Affects turn completion, stability, and how the ski releases from turns.

In practice

AT ski tails vary based on intended use. Skis with wider tails (110–130mm) provide more support for charging in soft snow, while narrower pin tails (100–110mm) offer easier turn release and a more surfy feel. Many AT skis feature a slightly tapered tail to reduce weight and improve maneuverability.

Compared to other types

AT skis often have more tail taper than freeride skis, resulting in narrower tails relative to tip width. This reduces swing weight and makes the ski easier to pivot in technical terrain.

What it means

The theoretical radius of the smallest turn the ski can make when tipped on edge, measured in meters. Derived from the sidecut dimensions. Determines the natural turn shape of the ski.

In practice

Most AT skis have turn radii between 15–24m, with the 17–20m range being most common for all-around backcountry use. Shorter radii (15–17m) suit tight trees and technical terrain, while longer radii (20–24m) provide stability in open alpine terrain at speed.

Compared to other types

AT skis typically have longer turn radii than frontside/carving skis (10–16m) due to their wider dimensions, and similar radii to all-mountain wide and freeride skis.

What it means

The longitudinal shape of the ski when unweighted—how it curves from tip to tail. The most influential design element for how a ski feels and performs.

In practice

Tip & tail rocker with camber underfoot is the most common profile for AT skis, providing flotation in soft snow, easy pivot in variable conditions, and enough edge hold for firm snow descents. Tip rocker with camber through the tail is preferred by skiers who want more tail edge hold for firm snow and steeps.

Compared to other types

AT skis favor more rocker than frontside and all-mountain skis because backcountry snow is predominantly soft or variable. Full camber is rare in AT skis because it provides poor flotation. Full rocker is uncommon except in dedicated powder touring skis.

What it means

How stiff or soft the ski is along its length, typically rated on a scale. Affects edge hold, stability, energy transfer, and forgiveness.

In practice

AT skis typically fall in the medium to medium-stiff range (5–8). Softer flex (5–6) is more forgiving and easier to initiate turns in variable snow, preferred by lighter skiers and those covering long distances. Stiffer flex (7–8) provides better edge hold on firm snow and stability at speed for aggressive skiers charging big lines.

Compared to other types

AT skis are generally softer than racing and expert freeride skis (8–10) because softer flex saves weight and provides more forgiveness in variable snow. They are similar in flex to all-mountain skis but may feel slightly softer due to lighter construction.

What it means

The primary material used in the ski's core, which largely determines its weight, flex characteristics, dampening, and feel.

In practice

Lightweight hybrid cores using paulownia, balsa, or air-channel designs are most common in AT skis, prioritizing weight savings for uphill efficiency. Some models use full wood cores (poplar, ash) for better downhill performance at the cost of weight. Wood + composite cores with carbon stringers offer a middle ground.

Compared to other types

AT skis are the most likely category to use lightweight hybrid cores. Resort-oriented skis typically use denser wood or wood+composite cores for better performance. Foam cores are rare in AT skis because they lack the durability needed for backcountry use.

What it means

The method used to build the ski's structure, affecting durability, edge hold, weight, and price.

In practice

Sandwich/sidewall construction is most common in AT skis because it provides the best edge hold on firm backcountry snow and the durability needed for variable conditions. Hybrid construction (sidewall underfoot, cap at tips) is also popular as it reduces swing weight in the tips and tails.

Compared to other types

AT skis use similar construction to freeride and performance all-mountain skis. Full cap construction is rare in AT skis because the edge hold compromise is unacceptable for backcountry use where firm snow is common.

What it means

The total weight of both skis, measured in grams. Affects swing weight, touring efficiency, and overall maneuverability.

In practice

AT ski weights vary dramatically by intended use. Ski mountaineering skis can be as light as 2400–2800g per pair. All-around backcountry skis typically weigh 3000–3600g. Heavier backcountry freeride skis reach 3800–4200g. The 3000–3400g range is the sweet spot for most skiers balancing uphill and downhill performance.

Compared to other types

AT skis are significantly lighter than resort freeride skis (4200–5500g) and racing skis (4000–5000g). They are comparable to or lighter than all-mountain skis (3400–4400g). The weight difference is the primary trade-off versus resort-oriented skis.

What it means

The rider ability level the ski is designed for, which determines flex, forgiveness, and performance characteristics.

In practice

AT skis are primarily designed for advanced to expert skiers because backcountry skiing requires strong technique for variable, uncontrolled snow conditions. Some intermediate-friendly models exist with softer flex and easier initiation, but backcountry travel itself demands solid skiing fundamentals for safety.

Compared to other types

AT skis skew higher in skill level than all-mountain and frontside skis because the backcountry environment is more demanding. Beginner and lower-intermediate skiers should develop skills at resorts before venturing into the backcountry.

What it means

The primary terrain and snow conditions the ski is optimized for. Most skis handle multiple terrain types but excel in specific conditions.

In practice

AT skis are optimized for backcountry/off-piste terrain but must also handle powder and mixed conditions. The best all-around AT skis perform competently in all three. Some models are specialized—narrower for ski mountaineering (firm snow focus) or wider for deep powder missions.

Compared to other types

AT skis are the only category specifically designed for backcountry terrain. While freeride skis also handle off-piste conditions, they lack the weight optimization and binding compatibility for efficient uphill travel.

What it means

Whether the ski has an upward-curving tail matching the tip, allowing the skier to land and ski backwards (switch).

In practice

Most AT skis have flat or slightly raised tails rather than full twin tips. A flat tail provides better edge hold on firm snow and more powerful turn completion—important for backcountry conditions. Some models feature a partial twin tip (slight tail rise) as a compromise for switch capability and easier turn release.

Compared to other types

AT skis are less likely to have twin tips than freestyle and playful all-mountain skis. Freeride skis are split between twin tip and flat tail designs. The backcountry emphasis on edge hold and power favors flat or partially raised tails.

What it means

The ski's ability to absorb vibrations and chatter at speed, typically achieved through metal layers, rubber, or specialized technologies. Affects smoothness and edge contact.

In practice

Most AT skis feature minimal to moderate dampening to save weight. Minimal dampening is common in lightweight touring skis, resulting in a livelier feel that can chatter at speed on firm snow. Moderate dampening is found in heavier AT skis that prioritize downhill performance. High dampening is rare because it requires metal layers that add significant weight.

Compared to other types

AT skis have significantly less dampening than freeride and racing skis, which often feature titanal layers for smoothness. This is the most noticeable difference when skiing AT skis at resorts—they feel more lively and less planted at speed compared to metal-reinforced resort skis.

What it means

Whether and how the ski incorporates metal (typically titanal/aluminum) layers in its construction for added torsional rigidity, edge hold, and dampening.

In practice

The vast majority of AT skis have no metal layers to minimize weight. Some heavier backcountry freeride models incorporate a single titanal layer for improved edge hold and dampening, but this adds 150–250g per ski. Double metal layers are extremely rare in AT skis due to the prohibitive weight.

Compared to other types

AT skis are the least likely category to feature metal layers. Freeride and racing skis commonly use single or double metal for maximum edge hold and dampening. All-mountain skis are mixed. The absence of metal is a key differentiator and the primary reason AT skis feel less damp at speed.

What it means

The type of binding mounting system the ski supports, which determines which bindings can be installed.

In practice

AT skis are designed with touring binding compatibility as standard, featuring reinforced mounting zones for tech/pin bindings. Many also support hybrid mounting for skiers who use both touring and alpine bindings. The hybrid option is ideal for one-ski quivers that see both resort and backcountry days.

Compared to other types

AT skis are the only category where touring compatibility is standard. All-mountain and freeride skis typically use flat alpine or system alpine mounts. Some freeride skis are now offered in touring-compatible versions, reflecting the growing backcountry market.