100% Cotton Printed graphics Please refer to the size chart for accurate measurements How to Measure Yourself Shoulder: Measure from shoulder tip to shoulder tip across the back. Pit to Pit: Measure from one armpit to the other across the fullest part of your chest. Sleeve: Measure from the shoulder seam to the end of the sleeve. Back: Measure from the base of the neck to the bottom of the garment. Size Chart Size S M L XL Shoulder (in/cm) 18.27" / 46.4 cm 19.06" / 48.4 cm 19.84" / 50.4 cm 20.63" / 52.4 cm Pit to Pit (in/cm) 20.87" / 53 cm 21.85" / 55.5 cm 22.83" / 58 cm 23.82" / 60.5 cm Sleeve (in/cm) 8.90" / 22.6 cm 9.17" / 23.3 cm 9.45" / 24 cm 9.72" / 24.7 cm Back (in/cm) 25.59" / 65 cm 26.57" / 67.5 cm 27.95" / 71 cm 28.94" / 73.5 cm