What Our Gearhead(R) Experts Are Saying: "This merino base layer is soft, warm, and durable. It's comfortable enough for everyday wear but performs just as well on ski tours and alpine climbs. The wool regulates temperature perfectly. I stay warm even when it's damp and never feel clammy."The Norr na femund pureUll Long Sleeve is crafted from 100% premium 18. 5-micron merino wool for natural performance in all conditions. Designed as a midweight base layer, it offers the perfect balance of warmth, moisture management, and next-to-skin softness, making it as suitable for daily wear as for demanding mountain days. The pureUll fabric is temperature-regulating, naturally odor-resistant, and highly durable, resisting pilling and abrasion better than standard merino. With its clean design, asymmetric longer back cut, and articulated arms, this long sleeve provides reliable comfort and mobility whether you're trekking, climbing, or layering for ski touring. Responsibly sourced and RWS certified, it's a sustainable piece built to last season after season.