The seat portion 17 is also contoured to position the body of a person and curves upwardly and rearwardly into the back portion 16 as indicated best in FIG. 13. It has two depressions or cavities 22 on either side of a central rounded or convex ridge 24. When a person is seated in the device 15, the contoured back rest portion 16 ensures that the back of the person is supported in the correct anatomical position without sagging or curving, while the seat portion 17 supports the seat of the body in the manner previously described. The device thereby assists in counteracting fatigue which may arise from an incorrect body posture. The back rest portion 16 as well as the seat portion 17 may have vents 25 to dissipate body heat generated by a person seated in the device. Also, it is preferred that the seat portion 17 have its upper surface roughened to prevent sliding forward of a person seated thereon. Also, if the device is merely to rest on another seat, it is preferred that its lower surface be roughened to prevent sliding thereon.
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