The Arc’teryx Acrux series currently comprises the most technical boots in the Arc’teryx lineup. There are three models in the range – the trekking-focused Acrux TR, the minimalist yet capable Acrux LT and the pinnacle Acrux AR.
We’d class the Acrux TR as a classic ‘three-season boot’, while the AR is a winter-ready, four-season insulated mountain boot with a removable liner. The Acrux LT sits somewhere in the middle of the pack. It’s a sleek and streamlined climbing and mountaineering boot, perfect for three-season alpine use. The focus here is on precision and feel on steep rock and ice, with plenty of heel-to-toe stiffness that enables the Acrux LTs to be paired with C2 crampons. But the boot’s real USP – as that ‘LT’ (‘Lightweight’) acronym suggests – is their remarkably low weight.
As we’ve come to expect from the Canadian outdoor brand, these boots utilise cutting-edge materials and design.
Let’s start from the bottom up. The Acrux LT is built on a Vibram Litebase outsole, the latest technology from the Italian rubber manufacturer that effectively reduces the sole thickness by 50% and therefore the overall weight of the sole unit by around 30%. Underfoot, the boot uses Vibram’s tried and tested Mont lug pattern, with an extended climbing zone at the toe for optimum contact grip.
The midsole features a 3mm carbon fibre shank embedded in PU (polyurethane) foam rubber, with a compressed EVA overlay. This ensures plenty of stiffness and stability underfoot with minimal weight, as well as durable cushioning. A plastic heel insert at the rear ensures compatibility with C2 semi-automatic crampons.
“Despite its considerable technical capabilities, the Acrux LT is remarkably lightweight for a B2 boot.”
The uppers are made from an ultralight woven polyester fabric called ‘SuperFabric’, which is designed to be flexible but exceptionally abrasion resistant. Low profile climbing-style lacing extends down the vamp almost to the toe, just like you’d find on a rock shoe. The lower eyelets are almost completely hidden for a cleaner look and a no-fuss design that works particularly well with crampons fitted or when tight, precise footwork is needed. The upper triple lets of lace hooks employ metal hardware in black powder-coated steel.