Men's StreamWool long underpants in merino wool. The high waist, elastane-containing waistband and material that can be worn either way make these pants unique. StreamWool is Aclima's newest fiber, which is used to make, among other things, reversible products. The fiber gets its name from the wave-like shape of the fiber on one side, the other side is smooth, soft knit. The combination of knits forms wave-like insulating air channels in the fabric. StreamWool is one of Aclima's warmest materials. Non-chafing seams Thanks to the Total Easy Care treatment, there is no itching and very little shrinkage Weight 360 g (size M) Material 99% merino wool, 1% elastane Fabric weight: 400 g/m² (19.5 microns)