Zip opening provides custom ventilation and allows you to adapt to conditions Funnel neckline keeps you protected from icy breezes Sherpa-inspired construction provides soft, insulating warmth The next generation of our Steens Mountain line, this outdoor staple features a finely tuned fit and a soft, durable fleece to keep you warm no matter what. The zip neckline allows for versatile wear a cooling when you need a bit of ventilation, with the standard fit meaning it'll layer nicely over the tee of your choice.