... stink like synthetics,natural stretch for a comfortable fit.It's like a second skin.Materials:100% merino wool Micron:17 ... superfine merino wool (17.5Mic ~ 18.5Mic), after wool top’s mercerization, the product is soft, plump, flexible, delicate, smooth, comfortable ... ,and Looking forward to your specific inquiries. Merino Wool Baby's Underwear Pants