This is an awesome shirt from Lululemon and just in time for the cooler weather! It's in great pre-owned condition and comes from a clean, pet free, smoke free home. Rare find!! From lululemon: At the core of our run, we want to be warm. Why we made this When we muster up the courage to face the cold, we want a warm layer to have our back (and our front). We developed this technical long-sleeve shirt with soft, brushed Microfleece fabric in the body to help us get out and get going. Moisture-wicking Rulu light fabric sleeves and mesh paneling help us let out the heat when our core's warmed up. Key features the thick Microfleece fabric is designed to help heat up your core four-way stretch Rulu light sleeves are moisture-wicking and breathable to help keep you comfortable thumbholes help keep your sleeves down and wrists warm wear it on its own or as a mid-layer on chilly days mesh panels under the arms help you let off steam Tech specs designed for: run fabric(s): Microfleece, Rulu light properties: chafe-resistant, moisture-wicking, breathable, preshrunk fit: loose length: bum covering BL029