... won't stink like synthetics,natural stretch for a comfortable fit.It's like a second skin. Main merino wool fabric : ... MaterialConstructionWeight Fineness100%Merino Wool S/J150gsm-170gsm 17.5micron100% Merino Wool S/ ... superfine merino wool (17.5Mic ~ 18.5Mic), after wool top’s mercerization, the product is soft, plump, flexible, delicate, smooth ...