When our furnace stopped working on a colder than normal autumn day, my son immediately put on his beloved pair of SmartWool socks. They’re so warm, I threw on mine too! SmartWool products are made ...

Recently, you may have seen the term “3D-knit” listed in a product description. More likely than not, it was a shoe — it’s how Nike makes its Flyknit uppers, and Adidas uses it to create Primeknit.