11.5.4-2 Chair Surface Configuration/Material

For both the seat pan and the backrest, the surface configuration/material should have the following characteristics:

 

  1. have a flat, firm shape but with enough softness or elasticity to deform
  2.  

  3. have resilient or elastic properties to absorb shocks
  4.  

  5. support body weight, primarily around the two bony points of the pelvis
  6.  

  7. be shaped to follow the inward curve of the lower back and provide adequate support to that region of the back
  8.  

  9. avoid applying pressure under the thighs
  10.  

  11. be perforated or ventilated, to prevent “hotness” or “sweatiness”
  12.  

  13. be durable, nonslip, and porous
  14.  

  15. allow the user to shift positions 1472G