Outdoor Research Alpine Onset Merino 150 Quarter Zip Top - Men's

Base layers live or die on temperature regulation, and the Alpine Onset Merino 150 Quarter Zip Top handles it with a 150-weight blend of non-mulesed merino wool and recycled polyester that breathes hard on the skin track and holds warmth on the way down. Raglan sleeves, thumb loops, and flat-seam construction keep chafe out of the equation, and UPF 30 coverage means it pulls double duty from spring corn season through fall alpine starts.