The lightest womens merino-wool t-shirt with a 150g / m2 weight from the American brand Smartwool offers tight fit, raglan sleeves and flat notebooks. Merino wool accounts for 87% of the material, 13% is made of nylon fibers around which merino is wrapped to increase strength. The fineness of merino fibers is 17-20 microns (for comparison - the hair has 50 microns). The shirt has raglan sleeves and side seams for better grip on the body.