The bellows is a flexible section under the toe box that allows the foot to flex forward at the ball while the toe remains secured to the ski. This enables the heel to rise off the ski during a telemark turn, making the signature drop-knee motion possible.
Ski Boots · Telemark Ski Boots
Why do telemark boots have a bellows?
Related gear types
If this answer nudged you toward a different style, these guides compare specs and trade-offs.

Freeride / Big Mountain Ski Boots
$450 – $1100
Powerful boots built for aggressive off-piste skiing in deep snow and steep, technical terrain.
Stiff flex (120-150)Wider last (98-104mm)Often includes walk mode

Alpine Touring (AT) / Backcountry Ski Boots
$400 – $1300
Lightweight boots with walk mode and tech-compatible soles designed for uphill skinning and downhill skiing in the backcountry.
Walk mode with 50-70° range of motionTech binding compatibilityLightweight construction (1.2-1.8kg per boot)

Nordic / Cross-Country Ski Boots
$80 – $500
Lightweight, flexible boots for cross-country skiing in classic, skate, and touring disciplines.
Flexible sole for foot articulationToe-only binding attachmentLow to mid cuff height
More questions
- What is the difference between NTN and 75mm telemark boots?
- Can I use telemark boots with regular alpine bindings?
- Are telemark boots good for backcountry skiing?
- How stiff should a telemark boot be?
