Rapha Men's Merino Lightweight Base Layer - SleevelessThe Merino Mesh Base Layer is a versatile, year round essential designed for exceptional performance in variable conditions. Constructed from a high grade merino mesh, it utilizes the natural properties of the wool to provide an anti bacterial, itch free, and odour resistant foundation. This base layer excels at temperature regulation, keeping you warm in the winter when paired with a jacket, or cool and dry in the summer beneath a lightweight jersey.