Built from NIKKE AXIO hybrid fabric — a proprietary blend of 84% merino wool and 16% polyester developed and knit in Japan — this turtleneck base layer delivers reliable thermal regulation without relying on polyurethane. The 18.5-micron merino fiber sits close to skin without irritation, while flat-seam construction, raglan sleeves, and underarm gussets allow unrestricted movement across skiing, winter hiking, and cold-weather activities. A slim regular fit transitions cleanly between use as a standalone top and as part of a layering system, with cuffs engineered to stay in place when pushed up.