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.