NEXT-TO-SKIN PERFORMANCE WHY IT'S SPECIAL: Our lightest weight base layer ever, perfect for most cool and cold conditions Nuyarn® is a spinning technology that makes merino 35% more thermally efficient, 85% more elastic, and 8.8x more durable than its ring-spun counterparts Raglan sleeves, flatlock stitching, and thumbholes to excel at any activity GOOD TO KNOW: Love the Woolies 1 Collection? This is its future.