S      38"-40" chest,   15"-15 1/2" neck M     41"-43" chest,   16"-16 1/2" neck L      44"-46" chest,   17"-17 1/2" neck XL    47"-49" chest,   18"-18 1/2" neck XXL  50"-52" chest,   19"-19 1/2" neck

100% neoprene, machine wash cold, hang dry