K2 Thraxis Snowboard Boots
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K2 Thraxis Snowboard Boots

$539.95
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Thraxis Unisex Snowboard Boot

A clear leader in the freeride category — the Thraxis is K2's stiffest flexing and most supportive boot in the lineup, built for the most demanding riders. The zonal BOA® Fit System features three BOA® dials — two targeting zonal exterior lacing and one controlling the Conda™ liner fit system. By placing a soft, urethane "chip" around the 45° of the ankle, riders can micro-adjust their boot fit and eliminate heel lift. The most supportive Intuition™ liner uses multiple densities of heat-moldable foam — open-cell construction means it can be re-molded time and time again to achieve the perfect fit throughout the boot's life. Spaceheater™ lining keeps feet warm and dry, while 95% post-consumer recycled SCafe™ coffee mesh eliminates odor. Underfoot, the lightweight stable EVA + Eco-Harshmellow™ midsole absorbs impact and provides a quieter ride, while the Vibram® V5 outsole (≥30% recycled rubber through Vibram® Ecostep) provides unmatched traction.

Three BOA® Dials with Zonal Control
Zonal BOA® Fit System with three BOA® dials — two targeting zonal exterior lacing for upper and lower zones, and one controlling K2's Conda™ liner fit system. Most adjustable boot in the K2 line for the dial-in precision serious freeriders demand.
Urethane "Chip" Ankle Adjustment
A soft, urethane chip placed around the 45° angle of the ankle — lets riders micro-adjust their boot fit and eliminate heel lift. Fine-tunable ankle hold for technical descents and aggressive carving.
Multi-Density Intuition™ Pro Foam Liner (Re-Moldable)
K2's most supportive liner — composed of multiple densities of heat-moldable Intuition™ foam. Open-cell construction means the liner can be re-molded time and time again throughout the boot's life, achieving the perfect fit at every stage.
TX3 Textile Lace
A flexible, low-friction textile lace that provides a soft, modern design aesthetic with lasting durability and strength. Different from standard laces — smoother operation, longer lifespan, more refined feel.
Vibram® V5 Outsole (Ecostep Recycled)
Premium rubber compound provides industry-leading durability and grip — integrated with Harshmellow™ foam to absorb chatter and vibration. Made using at least 30% recycled rubber through the Vibram® Ecostep program for a more sustainable build.
Eco-Harshmellow™ Midsole + Insole
Lightweight and stable EVA midsole paired with Eco-Harshmellow™ — K2's proprietary technology that absorbs impact, increases damping, and provides a quieter ride while snowboarding. Vibration dampening from outsole to insole.
S'Cafe™ Coffee Mesh + Spaceheater™
95% post-consumer recycled SCafe™ coffee mesh integrated into the liner for natural odor elimination. Paired with breathable and heat-reflecting Spaceheater™ material — keeps feet warm and dry all day long.
Flex Zone Upper Cuff
Designed to retain a consistent flex pattern while reducing shell distortion when flexing — the cuff flexes smoothly without warping the boot's overall structure. Maintains integrity through aggressive riding while preserving the boot's flex feel.

General

Gender
Unisex (designed and tested for men and women)
Riding Level
Advanced, Expert
Best For
Freeride, Powder
Lacing System
3 BOA® dials (2 zonal exterior + 1 Conda™ liner) with TX3 textile lace
Flex Feel
Stiffest flexing and most supportive model in K2's collection
Special Feature
Urethane "chip" ankle adjustment around 45° for micro-adjustable fit

Construction

Liner
Multi-density Intuition™ Pro Foam (heat-moldable, re-moldable throughout boot's life)
Liner Tech
Spaceheater™ heat-reflective + 95% recycled SCafe™ coffee mesh (odor elimination)
Lacing Material
TX3 low-friction textile lace (soft, modern, durable)
Midsole
Lightweight stable EVA + Eco-Harshmellow™ (impact absorption + vibration dampening)
Outsole
Vibram® V5 — ≥30% recycled rubber through Vibram® Ecostep program
Insole
Eco-Harshmellow™ Pro Insole
Upper Cuff
Flex Zone upper cuff (reduces distortion while flexing)

Sizing

Sizes Available (Unisex)
M 4 / W 5 through M 13 / W 14 (17 sizes total)
Sizing Note
US sizing — Unisex boots use US Men's sizing. Select your Men's size if you're a man, Women's size if you're a woman.
US Men's US Women's EU UK CM (Foot Length)
4 5 36.5 4 23.0
4.5 5.5 37 4.5 23.5
5 6 38 5 24.0
5.5 6.5 38.5 5.5 24.5
6 7 39 6 25.0
6.5 7.5 40 6.5 25.5
7 8 40.5 7 26.0
7.5 8.5 41 7.5 26.5
8 9 42 8 27.0
8.5 9.5 42.5 8.5 27.5
9 10 43.5 9 28.0
9.5 10.5 44 9.5 28.5
10 11 44.5 10 29.0
10.5 11.5 45 10.5 29.5
11 12 45.5 11 30.0
11.5 12.5 46 11.5 30.5
12 13 47 12 31.0
13 14 48.5 13 32.0
Re-Moldable Liner Care
The Thraxis's Intuition™ Pro Foam liner is re-moldable throughout the boot's life — not just once at the start. Have a qualified boot fitter heat-mold the liner periodically to maintain the perfect fit as the foam settles or as your foot shape changes. Open-cell foam accepts re-molding reliably.
BOA® System Care
Three BOA® dials to keep clean and free of snow/ice. Tap each dial after each run to dislodge debris. The TX3 textile lace is replaceable through K2 customer service if frayed. The Conda™ chip ankle adjustment should be periodically checked for proper tension.
Shell & Outsole Care
Wipe the shell with a damp cloth after riding to remove salt and grime. The Vibram® V5 outsole can be cleaned with a stiff brush to remove packed snow — the Eco-Harshmellow™ midsoles will continue dampening vibration even with packed snow. Vibram® Ecostep construction is durable and sustainable.
Storage
Store the boots in a cool, dry place between sessions. Loosen all BOA® dials and release the Conda™ ankle chip tension between rides to extend the life of the closure system. Keep buckles open to let the liner air out.
Sizing & Fit
The Thraxis uses unisex sizing (select Men's if you're a man, Women's if you're a woman). For the best fit, size down 1cm from your measured foot length (Mondopoint). The stiffest flex means precise sizing matters — don't size up for comfort. Heat-moldable for custom fit; have a qualified boot fitter handle any custom molding.

Shipping Policy

Components:

All component items (wheels, drivetrains, suspension, brakes, etc.) ship within 4-7 business days of purchase.

Bicycles:

Complete bikes typically ship within 2–3 weeks due to build, tuning, and inspection times. You will receive tracking information as soon as your order is ready to ship.

 Gear & Apparel:

Outdoor Gear and apparel orders (helmets, jerseys, gloves, etc.) ship within 5-21 business days. Please reach out to us with the most up to date deliveries times as they vary per Manufacturer. 

Returns & Exchanges:

If you received the wrong size or wish to exchange an item, it must be returned in original condition—unused, uninstalled, and with all packaging intact.

For full details, please see our Refund Policy before initiating a return.

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Prepared with intention.

Every product is carefully inspected and handled by our team before it ships. From fit and function to final details, we make sure each piece is ready for the outdoors ahead—so you can focus on the experience, not the gear.

Passion drives us

At SpokeX Bike Co., bikes aren't just our business — they’re our way of life. As a rider-owned and operated shop, every decision we make comes from firsthand experience on the trail, at the race, and on the open road. We know what it’s like to chase a new line, push through the pain cave, and celebrate the ride — because we live it every day.

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