Mens Size GuidePlease note fabric has a give of 2 inchesGym Pants SizeWaistSmall31 InchesMedium33.5 InchesLarge35.5 InchesTracksuit SizeChestSmall37/38 inchesMedium39/40 inchesLarge41/42 inchesOversized T-Shirt Size ChestMedium40 inchesLarge41 inchesX-Large42 inches