A vehicle seat comprises a carrier including first, second, third, and fourth carrier members and a strap disposed across opposing first and second carrier members. The strap includes a first end fixedly coupled to the first carrier member and a second end adjustably coupled to an attachment assembly disposed on the second carrier member. A rod is disposed transverse to the strap and is coupled to opposing third and fourth carrier members, wherein the attachment assembly includes an adjustment mechanism for setting a usable length of the strap, and wherein the usable length includes a first usable length, a second usable length, and an intermediate length between the first usable length and the second usable length.