The Mons Royale Yotei Tech Long-Sleeve Top goes on first thing and stays on all day. A loose cut leaves room to move, and thumb loops hold the sleeves in place. This merino long sleeve is made of 100% merino wool, so it stays comfortable from the first hour to the last. What Our Gearhead(R) Experts Are Saying:"Over a full day on my feet that started cool and warmed up, I never felt clammy in this top. Merino moves heat and sweat out naturally, so it stayed comfortable as the day warmed."