The Terramar 3.0 Ecolator 1/4 Zip Mens Heavyweight Top is a great layering option for long days on the mountain. This 1/4 zip top is slimmer fitting for easy layering and features 4-way stretch fabric for unrestricted range of motion. The features continue with ClimaSense Thermoregulation Technology that quickly wicks away moisture and traps heat to keep you dry and warm. Add the UPF 50+ rating and its easy to see why the Terramar 3.0 Ecolator 1/4 Zip Mens Heavyweight Top is a must-have for this winter. ClimaSense Thermoregulation Technology. Moisture Wicking and Quick Drying. Heavyweight (3.0) Baselayer. UPF Rating 50+. Functional Thumbholes. Flat Seam Construction.