Specially designed for the left, right or bilateral amputee. Clack leatherette zippered cover. Leg extension are approximately 1/2 of the seat width x 9"L. Overall length with leg extension is 25", Overall thickness is 1½" for the Narrow Adult, Adult and X-Wide models and have a 5/8" plywood base. The XX-Wide (22" and larger) have an overall thickness of 2½" and have a ¾" plywood base. Meets CA-117 code.