The Arc'teryx Women's Rho LT Zip Neck is a lightweight and durable synthetic base layer top. Made with a blend of polyester and elastane, it offers excellent moisture-wicking properties and quick-drying capabilities. The zip neck design allows for easy ventilation and temperature control. The slim fit provides a comfortable and supportive feel. Whether you are climbing, skiing, or engaging in other high-intensity activities, this top will keep you comfortable and dry. With its superior quality and performance-driven features, it is no surprise that it is one of the most wished-for women's synthetic base layer tops on Amazon.