https://vuoriclothing.com/products/waffle-crew-light-heather-grey Crafted like a classic thermal, the Waffle Crew’s knit fabric is made from a stretchy cotton blend that is breathable yet ultra cozy. With four-way stretch and rib details at the neck and cuffs, this piece can be layered or worn solo. Trust us, you’ll want it for everything. Great for traveling, running, hiking and chilling.