So, how else does the new Kilo XTR differ from last season’s Kilo Boots? The changes aren’t drastic—you can think of the XTR as an evolution, not a revolution. La Sportiva aimed to create a stiffer, more downhill-focused version of the Kilo, increasing the flex rating from 110 to 120. By adding a stiffer Pebax Rnew tongue, they achieved the desired performance boost without significant weight gain. At just 190 g heavier for the pair, the new XTRs maintain all the original Kilo’s features. If you want to get picky, cuff rotation does drop slightly from 70° to 68°, but you’ll hardly notice that.

The Kilo XTR’s Grilamid Bio-Based LF Carbon shell provides a lightweight yet rigid structure, while the Force Power Buckle and Closure System ensure a secure, adjustable fit.

As mentioned, the Pebax Rnew tongue contributes to the 120 flex rating, while the 68° range of motion still delivers efficient climbing on even the steepest skin tracks.

The Tilt-Lock Lite ski/walk mechanism is intuitive and easy to operate, even with gloves on.

Inside, the Ultralon Thermomoldable High-Density liners offer comfort and customization with a quick heat fit from a qualified boot fitter. The WarmSole Platform keeps your feet insulated from the shell and adds welcome warmth for those cold dawn patrol starts.

Externally, the FriXion Wave Alpine outsole provides aggressive traction—from rocky ridge ascents to slick lodge floors.

The 90° cuff opening along with the elastic gaiter are designed to ensures an easy, fast, and intuitive entry and exit while putting on or taking off the boots.

Shell and Cuff - Grilamid Bio Based LF Carbon
Tongue - Pebax Bio Based Rnew 1100
Liner -Ultralon Thermomoldable High Density PEE
Sole - WarmSole Platform (internal)  and FriXion Wave Alpine XTR Outsole 
FORCE Flex System - FORCE Technopolymer Buckles  and FORCE Power Buckle 
Ski/Walk System - TILT-LOCK LITE Mechanism

• Made with Grilamid Bio-Based LF Carbon, an innovative and rigid lightweight composite
• 120 flex index providing strong support for its weight class.
• 68°  range of motion for efficient ascending
• User-friendly Tilt-Lock Lite ski/walk mechanism that works even with gloves.
• The Force Power Buckle and Closure System allow for a secure and even fit across the foot and extra shin support.
• WarmSole Insulation in the soles
• 90° cuff design ensures easy entry and exit

The new Kilo XTR is a welcome addition to the line and helps La Sportiva compete with the ever-popular Scarpa Maestrale RS (125 flex, 2,920 g per pair). The Kilo XTR is much lighter and nearly as stiff, despite having one fewer buckle. The Scarpa F1 LT, with its 100 flex rating and 1,880 g per pair, is a fairer comparison to the regular Kilo. This is where the Kilo XTR shines—it’s as capable as the Maestrale RS but significantly lighter, sitting comfortably between Scarpa’s F1 line in terms of weight. The Kilo XTR’s performance-to-weight ratio is exceptional, allowing you to drive wider skis in variable terrain with confidence and control. It’s hard to find another AT boot in the 120-flex range that weighs so little.

Weight and stiffness aside, the Kilo XTR is more than just a strong backcountry performer. Its two-buckle design is simple, quick, and comfortable—easy to get into, ski, and exit. Most impressively, when you flip into walk mode, you immediately access the full 68° cuff rotation—no need to undo the power strap or buckles. This simplicity makes transitions effortless and efficient.

While the liners feel plush and comfortable out of the box, they may not be as durable as Intuition liners. The fabric is soft and well-insulated, but its bonded construction raises some durability concerns over time—particularly in high-wear areas like the heel pocket or cuff articulation zone. So far, early testing shows no issues, but time will tell.

With plenty of driving power, ease of use, and impressive comfort, the La Sportiva Kilo XTR is a winner in my book. It’s more capable than most boots in its weight and flex class, making it a top choice for advanced skiers seeking a lightweight AT boot that doesn’t compromise performance.