The Pectoralis major muscle (Pecs) is a thick, fan shaped muscle, situated at the chest of the human body .. it makes up the bulk of the chest muscles in the male and lies under the breast in the female .. this product is just the Pec muscles (chest) .. for an all around well developed look, wear, "Muscles for Males" (which can be found in my catalog) in combination with, "Well Defined Pecs" .. the 1st pic shows avatar wearing the pec muscles, the 2nd without.