close-fitting, seamless, very breathable long-sleeve merino top for midwinter tours. the ortovox 230 competition base layer top is made seamless in a circular knitting process to serve every body zone with the right merino thickness during exertion and cold. the basic rib structure with 190 g/m² merino gives the functional shirt elasticity for maximum freedom of movement.a particularly breathable mesh structure is used in heat spots, while the 240 g/m² thick wool provides warmth in cold-sensitive zones such as the kidney area.