To find your perfect Unisex size, grab your favorite tee shirt, lay it flat on a table, take a few measurements, and pick the closest matching shirt. If you are in between 2 sizes always go on the larger, chances are your favorite tee has shrunk a little since you got it. For a looser fit, order your standard size or size down for a semi-fitted look. Material: White and Cream tees are 100% cotton, Ash are 99/1 cotton/polyester and Peach are 52/48 cotton/polyester.