Bike Heartbeat T-Shirt Bicycle Cycling Mountain bike 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 Bike Heartbeat T-Shirt Bicycle Cycling Mountain bike - Makes a Perfect Funny Birthday gift for her or for him. Wear it day or night for an instantly awesome look! Lightweight, Classic fit, Double-needle sleeve and bottom hem