Michael Stars Black Ribbed Knit Crew Neck Long Sleeve T-Shirt One Size Fits Most *Fabric tag has been cut out *My best guess is this is 100% cotton *Ribbed knit *Perfect to fit into the capsule minimalist wardrobe *Very versatile item *Shown in last picture, some hem stitching has come loose Flat measurements are approximate. Armpit 15" Sleeve 26" Length 25"