It's made of Dime Knit™, AYR’s signature super satisfying heavyweight jersey. 100% cotton in a 10/1 singles weave, which means, in terms of heft, it's somewhere between a sweatshirt and a tee. Year-round cozy. The hem is meant to cover your bum and the sleeves are so long that your hands can turtle up in them. More pics to come! Runs a bit large - I’m usually a true small and this fits comfortably