Seating unit is filled with air, sand, silicon or pure foam with base and seating surface of slip-proof material and is wedge-shaped with rear rounded shape ending at human perineum

摘要

The seating unit is filled with air, sand, silicon or pure foam with its base and seating surface of slip-proof material. It is wedge-shaped with its rear rounded shape ending at the human perineum. Its use prevents stresses and compressions of the intervertebral disks in the spinal column.