65% Polyester, 35% Rayon Zip fly Button up collar Please refer to the size chart for accurate measurements How to Measure Yourself Shoulder: Measure straight across from shoulder tip to shoulder tip. Pit to Pit: Measure 1" below the armpit across the chest. Sleeve: Measure from the shoulder seam to the cuff. Back: Measure from the top of the shoulder down the back of the garment. Size Chart Size S M L XL XXL Shoulder (in/cm) 18.0" / 45.7 cm 19.0" / 48.3 cm 20.0" / 50.8 cm 21.0" / 53.3 cm 22.0" / 55.9 cm Pit to Pit (in/cm) 22.0" / 55.9 cm 23.0" / 58.4 cm 24.0" / 61.0 cm 25.0" / 63.5 cm 26.0" / 66.0 cm Sleeve (in/cm) 24.0" / 61.0 cm 24.5" / 62.2 cm 25.0" / 63.5 cm 25.5" / 64.8 cm 26.0" / 66.0 cm Back (in/cm) 28.0" / 71.1 cm 29.0" / 73.7 cm 30.0" / 76.2 cm 31.0" / 78.7 cm 32.0" / 81.3 cm