The M Boulder 125 Tee 1/4 Zip by Artilect is a long sleeve shirt with a stand-up collar and short zip. It was developed to combine functionality with a modern fit. The ultra-light Nuyarn 125 merino yarn in combination with matching, strategically placed eyelets under the arms stands for increased breathability and a very good warmth-to-weight ratio. With chafe-free flatlock seams. Stretchy, elastic and bluesign-certified.