Devold Expedition merino zip neck with silk is a two-layer wool base layer designed to withstand extreme weather conditions. The inside is made from 100% soft merino wool, while the outside consists of 90% Aquaduct-treated merino wool. The Aquaduct treatment in the outer layer enhances moisture absorption from the body and quickly wicks it away, allowing it to evaporate and keep you dry. This wool shirt is made from 100% natural fibers, now with 10% silk in the outer layer instead of polyamide. The silk adds increased durability and comfort, giving the classic Expedition base layer a luxurious feel and an updated look. The Expedition zip neck with silk offers exceptional insulation and unique moisture-wicking properties, making it the perfect solution for the coldest days.