Our Alpaca Base Layer Quarter Zip is made of the highest quality alpaca & blend, bringing you maximum comfort and breathability. Alpaca Dry Fusion Technology® wicks away moisture at an 85% higher rate than Merino wool, while also providing natural UV protection—so you can work out in it comfortably on a sunny, winter day; or wear it around town on a chilly, summer evening. A thoughtful fit is focused on functionality while maximizing aesthetics, making it best used in conjunction with our when a little more warmth is needed.