The Lurbel Alaska long-sleeve undershirt is an ergonomic, high-performance garment that offers maximum adaptability, breathability and thermoregulation of body temperature. It is an ergonomic high performance garment with thermal demand made of Dryarn that is an innovative polypropylene microfiber with high level performance. An innovative technological product because it is resistant and at the same time light, insulating and breathable, as well as being hygienic, comfortable and ecological. A very stable fabric, which does not shrink or expand like traditional fabrics, which retains its shape and lasts for a long time. Dryarn also dries surprisingly fast, favoring physical comfort and giving the skin a pleasant sensation of freshness and dryness. Dryarn guarantees a high level of performance for fabrics for underwear, sportswear and special technical applications, even in extreme use contexts.