A spring ride that starts chilly and ends in sunshine asks a lot of a base layer, and the Merino Long-Sleeve Base Layer meets it with a high-merino blend that regulates temperature as conditions change. The form-fitting cut sits close to the skin, so this merino base layer fits under a midweight jersey as the day warms up. What Our Gearhead(R) Experts Are Saying:"On long group rides that started cool and ended warm, the merino held steady from the first pedal stroke to the last and stayed itch-free against my skin. It smelled fresh when I peeled it off, so it went straight back into my kit."