SM - Fits up to a 34"chest and 26" length. MD - Fits up to a 40" chest. 28" length. LG - Fits up to a 44" chest. 30" length. XL - Fits up to a 47" chest. 30" length. 2X - Fits up to a 50" chest. 30" length. 3X - Fits up to a 56" chest and 31" length.