The Icebreaker Merino Women's Oasis Long Sleeve Crew Neck Top is a top-rated base layer top for active women. It is made from 100% Merino wool, which offers excellent temperature regulation, moisture-wicking properties, and odor resistance. The slim fit design allows for easy layering, while the flatlock seams reduce chafing. This top is perfect for hiking, skiing, or any other outdoor activities in cold weather.