Expedition 235

Designed for sustained sub-zero conditions, this heavyweight thermal layer prioritizes reliable heat retention over featherlight packability. It is built explicitly for winter mountaineers, polar expeditioners, and backcountry skiers who face static exposure in biting winds rather than high-output, shoulder-season aerobic training. Where lighter base layers falter under genuine freeze-thaw cycles, this piece acts as a dense thermal buffer that keeps core temperatures stable without requiring excessive supplemental midlayers.

Devold executes this warmth through a two-layer knit construction weighing in at 235 g/m². The skin-facing interior is woven from pure, non-scratch merino wool to trap body heat and preserve next-to-skin comfort, while the outer face incorporates a small percentage of polyamide blended with merino for structural integrity. The outer layer is finished with Devold's Aquaduct treatment, designed to draw moisture outward through the knit to evaporate quickly, avoiding the saturated, clammy feel that often plagues heavy, purely traditional wool garments.

In field use, the reinforced face fabric significantly reduces the pilling and harness-point wear common to standard pure merino tops. It is clearly too warm and bulky for mild transitions or fast trail runs above freezing, but when pitted against competing heavyweight cold-weather layers like the Smartwool Classic Thermal or Woolpower Ullfrotté, it strikes a disciplined balance of thermal efficiency, skin comfort, and hard-wearing durability.