An end effector of a surgical stapler includes first and second jaw membersand abuttress material. The first jaw member is moveable relative to the second jawmember. Thefirst jaw member includes a contact surface, a first projection, and a catch.The catchincludes first and second fingers distal of the first projection. The secondfinger is biasedtoward the contact surface. The buttress material defines a longitudinal axis.The buttressmaterial is releasably secured to the first jaw member. The buttress materialdefines first,second, and third slots formed therein. The first projection of the first jawmember isreceived in the first slot of the buttress material. The first finger of thecatch is received inthe second slot of the buttress material.
