DetailsLasting Size Chart Men's 230 g/m2, midweight 100% sustainably sourced Merino wool long underpants. They are designed for year-round use and for many different activities. A smooth, light single-layer fabric with flatlock seams and ankle cuffs prevents the pants from rolling up or turning inside out. Maximum comfort is due to excellent moisture wicking properties. This super fine Merino wool does not scratch or itch. Material: 100% Merino wool.