Divided into 3 variations, Expedition, Brushed Expedition, and Wilderness Expedition, Minus33 has you covered in all facets of the outdoors. The classic Expedition collection is our heaviest, and made of either Interlock or Brushed Knit, allowing the Merino Wool to keep you extremely warm as a base layer, or cozy as a lofty mid-layer. On the other hand, the Wilderness Expedition is a bit lighter, more durable, and just as warm. Its durability comes from the Ponte de Roma double knitting technique. This technique consists of two layers of fabric tightly knitted together, making it extremely durable and stretchy.