100% combed ringspun cotton fine jersey crew neck tee. Heathers are 93/7 combed ringspun cotton/polyester. Tees are "tagless" and unisex fit, running pretty true to size. As always if you are in between sizes, I always advise to order a size up to be safe. Shrinkage is minimal. For best results turn inside out to wash and dry on low heat or air dry.