I Am An Electrical Engineer I Solve Problems - Adult Shirt Printed to order in USA by professional printers. Ignore any Chinese sellers' bad fake imitations If unsure on sizing, order larger for a good fit. Guaranteed not to wash off or fade. Sizing to 5XL!! Chest width (inches): S=18; M=20; L22; XL=24; 2XL=26; 3XL=28; 4XL=30; 5XL=32 Tee Foundry is an Amazon Registered Brand. Our quality Tshirts are 100% pre-shrunk cotton. Tee Foundry are the only authorized seller, to ensure sizing matches and quality guarantees