An apparatus, comprising: (a) an end effector , wherein the end effector comprises: (i) an anvil , and (ii) a lower jaw , wherein the anvil is configured to move toward and away from the lower jaw ; (b) a cartridge , wherein the lower jaw is configured to receive the cartridge , the cartridge comprising: (i) a housing, (ii) a plurality of staples disposed in the housing, and (iii) a deck disposed over the plurality of staples, the deck defining a plurality of apertures , each aperture being substantially disposed over each staple, wherein the end effector is operable to drive the staples through the apertures of the deck toward the anvil ; and (c) a buttress assembly configured to be attached to either the anvil or the cartridge , wherein the buttress assembly comprises: (i) an adhesive layer configured to adhere to either the anvil or the deck of the cartridge , and (ii) a buttress body , wherein the adhesive layer is laid over the buttress body , characterized in that the buttress body comprises: a top mesh portion and a bottom mesh portion , wherein the top mesh portion has a first density and the bottom mesh portion has a second density, wherein the first density is greater than the second density, and wherein the top mesh portion is interposed between the bottom mesh portion and the adhesive layer . (a) an end effector , wherein the end effector comprises: (i) an anvil , and (ii) a lower jaw , wherein the anvil is configured to move toward and away from the lower jaw ; (i) an anvil , and (ii) a lower jaw , wherein the anvil is configured to move toward and away from the lower jaw ; (b) a cartridge , wherein the lower jaw is configured to receive the cartridge , the cartridge comprising: (i) a housing, (ii) a plurality of staples disposed in the housing, and (iii) a deck disposed over the plurality of staples, the deck defining a plurality of apertures , each aperture being substantially disposed over each staple, wherein the end effector is operable to drive the staples through the apertures of the deck toward the anvil ; and (i) a housing, (ii) a plurality of staples disposed in the housing, and (iii) a deck disposed over the plurality of staples, the deck defining a plurality of apertures , each aperture being substantially disposed over each staple, wherein the end effector is operable to drive the staples through the apertures of the deck toward the anvil ; and (c) a buttress assembly configured to be attached to either the anvil or the cartridge , wherein the buttress assembly comprises: (i) an adhesive layer configured to adhere to either the anvil or the deck of the cartridge , and (ii) a buttress body , wherein the adhesive layer is laid over the buttress body , characterized in that the buttress body comprises: a top mesh portion and a bottom mesh portion , wherein the top mesh portion has a first density and the bottom mesh portion has a second density, wherein the first density is greater than the second density, and wherein the top mesh portion is interposed between the bottom mesh portion and the adhesive layer . (i) an adhesive layer configured to adhere to either the anvil or the deck of the cartridge , and (ii) a buttress body , wherein the adhesive layer is laid over the buttress body , characterized in that the buttress body comprises: a top mesh portion and a bottom mesh portion , wherein the top mesh portion has a first density and the bottom mesh portion has a second density, wherein the first density is greater than the second density, and wherein the top mesh portion is interposed between the bottom mesh portion and the adhesive layer . <EOS>