Official Joe Bonamassa T-shirt - Tribut - Number One Tee Solid colors: 100% Cotton; Heather Grey: 90% Cotton, 10% Polyester; All Other Heathers: 50% Cotton, 50% Polyester Imported Machine wash cold with like colors, dry low heat Official Joe Bonamassa Brand T-shirt Official Concert T-shirt Lightweight, Classic fit, Double-needle sleeve and bottom hem