A method for installing a seat suspension layer on a seat frame having a first side frame member and a second side frame member opposed to and spaced apart from each other, the method comprising: moving a plurality of retainers on a first side of the seat suspension layer in respective directions substantially perpendicular to respective planes defined by the first and second side frame members for fastening onto a plurality of support members respectively located on a plurality of portions of the first side frame member , wherein the respective planes defined by the first and second side frame members are inclined relative to each other; and moving a plurality of retainers on a second side of the seat suspension layer in the respective directions substantially perpendicular to the respective planes defined by the first and second side frame members for fastening onto a plurality of support members respectively located on a plurality of portions of the second side frame member , the second side of the seat suspension layer being opposed to and spaced apart from the first side of the seat suspension layer ; wherein the respective planes are defined by pairs of a respective portion of the plurality of portions of the first side frame member and a corresponding respective portion of the plurality of portions of the second side frame member ; wherein each retainer on the first side of the seat suspension layer comprises an elongated body extending along a respective one of the plurality of portions of the first side frame member and each retainer on the second side of the seat suspension layer comprises an elongated body extending along a respective one of the plurality of portions of the second side frame members . moving a plurality of retainers on a first side of the seat suspension layer in respective directions substantially perpendicular to respective planes defined by the first and second side frame members for fastening onto a plurality of support members respectively located on a plurality of portions of the first side frame member , wherein the respective planes defined by the first and second side frame members are inclined relative to each other; and moving a plurality of retainers on a second side of the seat suspension layer in the respective directions substantially perpendicular to the respective planes defined by the first and second side frame members for fastening onto a plurality of support members respectively located on a plurality of portions of the second side frame member , the second side of the seat suspension layer being opposed to and spaced apart from the first side of the seat suspension layer ; wherein the respective planes are defined by pairs of a respective portion of the plurality of portions of the first side frame member and a corresponding respective portion of the plurality of portions of the second side frame member ; wherein each retainer on the first side of the seat suspension layer comprises an elongated body extending along a respective one of the plurality of portions of the first side frame member and each retainer on the second side of the seat suspension layer comprises an elongated body extending along a respective one of the plurality of portions of the second side frame members . <EOS>