What Our Gearhead(R) Experts Are Saying:"These are my go-to for everything from skintrack warm-ups to post-ride chilling. They're super breathable and the grid fleece keeps heat in without cooking me."From early-morning trailhead starts to crashing by the campfire after a long push, the R1 Pants from Patagonia deliver the lightweight warmth and stretch we rely on in the alpine. These pants are crafted from 6. 8oz Polartec(R) Power Grid(TM) fleece that's soft next to skin and built for movement with a touch of spandex. The internal grid design traps warmth while enhancing breathability and compressibility, making them an essential midlayer for cold-weather missions. We appreciate the R1 Pants not only for their performance but for their conscious construction. Made with 93% polyester-41% of which is recycled-and sewn in a Fair Trade Certified(TM) factory, they offer comfort with a conscience. Whether worn under shells for active layering or solo around basecamp, these fleece pants are a dependable addition to our cold-weather kit.