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 XXL Shoulder (in/cm) 18.25" / 46.4 cm 19.25" / 48.9 cm 20.25" / 51.4 cm 21.25" / 54.0 cm 22.25" / 56.5 cm Pit to Pit (in/cm) 20.5" / 52.1 cm 21.5" / 54.6 cm 22.5" / 57.2 cm 23.5" / 59.7 cm 24.5" / 62.2 cm Sleeve (in/cm) 9" / 22.9 cm 9.25" / 23.5 cm 9.5" / 24.1 cm 9.75" / 24.8 cm 10" / 25.4 cm Back (in/cm) 28" / 71.1 cm 29" / 73.7 cm 30" / 76.2 cm 31" / 78.7 cm 32" / 81.3 cm