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K2 Snowboards Thraxis 21/22

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Suitable for: Riding

Quick overview

Engineered for the most aggressive days, the K2 Thraxis boot is truly responsive and customizable. It is supportive and has a stiff flex. This will keep you riding whether it's in the resorts or deep in the backcountry. Three separate BOA® reels control three different zones on the boot to dial in precise fit, and new Endo™ 2.0 construction helps to retain the original boot flex for daily riding durability. When the terrain demands your full attention, the Thraxis helps you stay you laser focused and ready to drop.



Vibram® V5 Outsole features a full EcoStep rubber and Harshmellow™ pods under the toe and heel to reduce noise underfoot.
Abrasion resistant reinforced outsole rubber is placed in areas of high stress to extend the life of the boot and increase durability.
Harshmellow™ is a magical dampening system that replaces industry standard foam dampening materials. Harshmellow™ dampens the specific target vibration for each product and works to create the smoothest ride imaginable.


  • Sole: Vibram® V5 Outsole with Harshmellow
  • Flex/Tongue: 10/10, Rubber Reinforced Flex Zone Upper with Endo™ 2.0


The Intuition Pro Foam 3D is one of the most supportive liners, featuring a high-density Intuition® foam for added support without sacrificing comfort. This liner features both internal and external J-Bars around the ankles, where extra support is needed.
The Spaceheater footbed is warm and comfortable. By adding a reflective SpaceHeater™ material to the footbed on K2 boots, they are helping to trap heat inside the shell.
K2 has a patented Boa Conda liner lacing system that uses a urethane harness to gently hug your ankle, creating unrivaled heel hold. BOA® Conda™ allows for adjusting liner tightness and heel hold on the fly from outside of the boot, even with gloves on.
With functionality and sustainability in mind, K2 coffee mesh is made from recycled post consumer coffee grounds that is combined with post consumer recycled polyester. This mesh enhances odor control and moisture management of standard lining mesh and is made from 95% recycled material with no added chemicals.


  • Liner: Intuition® Pro Foam, 3D Liner with SpaceHeater™
  • Footbed: 3D Dual Density Footbed


The boot has a BOA Fit system for both the inner and outer shoe. This is the quickest and easiest adjustment on the market for a snowboard boot. This system has an even tension over the entire foot.
Performance Last is based around a D Last through the forefoot with a more performance-focused heel pocket, and also features 11° of forward lean.


  • Lacing: H4 Coiler BOA® Fit System
  • Last: Performance Last
K2 Snowboardboots 21/22 Sizechart
Mondo 23 23.5 24 24.5 25 25.5 26 26.5 27 27.5 28 28.5 29 29.5 30 31 32 32.5 33 33.5 34
US Mens 5.5  6 6.5 7 7.5 8 8.5 9 9.5 10 10.5 11 11.5 12 13 14 14.5 15 15.5 16
US Womens 6 6.5 7 7.5 8 8.5 9 9.5 10  10.5  11  11.5; 12        
Euro 36.5 38 39 39.5 40 40.5 41.5 41.75 42 42.5 43.5 44 44.5 45 46 47 48 48.5 49 49.5 50 50.5 51
UK 4 4.5 5 5.5 6 6.5 7 7.5 8 8.5 9 9.5 10 10.5 11 12 13 13.5 14 14.5 15 15.5 16