The Thermo Base Layer is a functional long sleeve shirt. It fits like a second skin while the brushed polypropylene material provides a dry and warm feeling. Moisture is quickly transported outside.Features:Extra-long backThermo-stretch functional fabricMinimized seams for less chafingFlat-lock seamsGlossary: Moisture ManagementThe body gives its best performance at a temperature of around 37 C / 80 F. Microfiber is essential for balanced temperature management, as it keeps the temperature constant. Products made of microfiber are more breathable than the best natural fibres and have excellent thermoregulation qualities, which suit their final use perfectly. Microfibers high level of stretchability and rapid drying qualities guaranty garments with a perfect cut and excellent wearability. Microfiber is also very resilient, durable and easy to care for.