Runs small. Slim fitted. Recommended to order a size or 2 up-see sizing chart. Short Sleeve T-Shirt. Gray Material: Athletic Heather 90/10 Cotton/Polyester blend- Soft Feel. Black Material: 100% Ringspun Cotton- Soft Feel. Pre-shrunk by Manufacturer (but will still shrink slightly after the first wash). Women Sizing (Slim Fitted- Runs Small): SIze Small to XL available (recommended to order a size or 2 up). Warning: During check out, purchase only from seller name: FTD Apparel (Original U.S. brand/seller and sole distributor of this product)- all other sellers are counterfeit and are likely shipping from China.