NWT. Size medium. There are base layers, and then there are the women's Burton Phayse Merino Base Layer Pants. It's the lightweight merino blend yarn that sets them apart from the crowd and gives them real-world breathability and comfort credentials. Wear them riding. Wear them hiking. Wear them daily. Any which way, they have you covered with all-natural temp regulation and a soft, easygoing feel. All-Natural Merino Power Merino wrapped nylon core yarn puts 100% merino against the skin for natural temperature regulation, breathability, and stink-free comfort. The nylon core adds strength for long-term fabric durability. VentedMerino mesh panels add extra breathability where you need it most.All the Tech Stretchy, breathable, and super soft with a wicking waistband.