Even though wool is decidedly old school, it’s once again the hottest “new” technical fabric. OK, hot is the wrong word—because wool keeps your core temperature more stable than other fabrics, whether it’s warm or cold outside. Wool is also amazingly breathable, and fights smell and bacteria better than “technical” fabrics tend to. It’s broadened its reach from winter to year-round wear and, when blended with other materials, is no longer the same scratchy fabric found in fisherman sweaters and peacoats of yesteryear. Here’s some of our favorite merino gear for this time of year.