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:
- have a flat, firm shape but with enough softness or elasticity to deform
- have resilient or elastic properties to absorb shocks
- support body weight, primarily around the two bony points of the pelvis
- be shaped to follow the inward curve of the lower back and provide adequate support to that region of the back
- avoid applying pressure under the thighs
- be perforated or ventilated, to prevent “hotness” or “sweatiness”
- be durable, nonslip, and porous
- allow the user to shift positions 1472G