I recently used the BasePro 1/4 Zip, top and bottom, on summit night and for sleeping at night on Kilimanjaro. For the weight it was the smartest article of clothing I brought. Simply put, you get what you pay for! I can't wait to use it on other hikes, hunting, snowmobiling, skiing and especially ice fishing. Heck, I may even wear it around the house in the winter, it's like thermal pajamas on steroids. :)