The Tuvegga pants have a smooth side, making them suitable for activities where breathability is most important. The other side is textured, allowing more air to accumulate between the skin and the fabric, which makes the pants warmer. This base layer works according to the nature of your activity and the outside temperature. Turn the smooth side against the skin for warmer weather and more intensive exercise. Turn the textured side against the skin for added warmth, making it more suitable for less active periods or colder weather. This model's legs are of the 3/4 length, making them perfect for use with ski boots. - Main material: 99% merino wool and 1% elastane - Contrast stripes: 100% merino wool - Fabric thickness: 250 g/m² - Fiber thickness: 18.7 microns (fine fiber) - Machine washable on wool program Devold undergarments are treated with a natural compound made to protect the apparel from wool-eating insects. It has a gentle, citronella-style scent and is completely harmless