NEW TECHNOLOGY, IMPROVED 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 Super soft, no-ride elastic and flatlock stitching for all day comfort 3/4 length bottoms are made to eliminate bulk in ski or snowboard boots GOOD TO KNOW: Love the Woolies 1 Collection? This is its future.