The Active Merino Movement Mock Neck Top splits its fabric evenly between Merino wool and TENCEL Lyocell, pairing Merino's natural temperature regulation and odor resistance with TENCEL's cool, smooth drape against the skin. Four-way stretch and flatlock seams keep the fit close through a workout without chafing at the shoulders or sides, and thumbholes at the cuffs add coverage when the effort slows down between intervals. A mock neck and slim fit round out a top built to move through stop-and-start training rather than just a steady push. What Our Gearhead(R) Experts Are Saying:"I run intervals in this, and the Merino keeps working through every rest period instead of going clammy once my heart rate drops. The TENCEL is doing real work too, keeping the fabric smooth against my skin instead of sticking the way straight wool sometimes can."