An arcuate base section with upper and lower surfaces separated by a thickness has an arcuate exterior periphery with a central front point and laterally spaced rear points, an arcuate interior periphery generally concentric with the exterior periphery, a width and a depth. Two lateral support sections and a central support section are in an arcuate configuration and have inner and outer surfaces separated by a thickness. The support sections have free upper edges and lower edge separated by a height. The lateral support sections are perpendicular to and integrally formed with the base section at the exterior periphery adjacent to the rear points. The central support section is perpendicular to and integrally formed with the base section at the interior periphery adjacent to the central front point. The system is fabricated in one piece of a material with limited flexibility and elasticity.
