100% Cotton Button up collar Chest pockets 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) 21.7" / 55.0 cm 22.4" / 57.0 cm 23.2" / 59.0 cm 24.0" / 61.0 cm Pit to Pit (in/cm) 25.6" / 65.0 cm 26.6" / 67.5 cm 27.6" / 70.0 cm 28.5" / 72.5 cm Sleeve (in/cm) 24.4" / 62.0 cm 25.2" / 64.0 cm 26.0" / 66.0 cm 26.8" / 68.0 cm Back (in/cm) 25.4" / 64.5 cm 26.2" / 66.5 cm 27.0" / 68.5 cm 27.8" / 70.5 cm