SM fits up to a 34"chest and 26" length. MD fits up to a 36" chest and 27" length. LG fits up to a 48" chest and 30" length. XL fits up to a 50" chest and 31" length. 2X fits up to a 54" chest and 31" length. 3X fits up to a 56" chest and 31" length. 4X fits up to a 64" chest and 33" length.