Coccydynia refers to pain originating from the coccyx, or tailbone pain.
Tailbone pain can have causes that aren't due to underlying disease.
Examples include trauma to the tailbone or prolonged sitting on an unpadded seat.
Seat cushions squish down due to two reasons:
They squish down, and they need to be extra thick.
Single layer PU/ memory foam tends to squish down for heavier weights. Since the air gap between the coccyx and seat surface is not maintained, the coccyx (tail bone) touches the surface of the chair and causes pain and discomfort to the user.
(Tested at 250 pounds / 112 kgs).
Soft foam (low density foam) is more comfortable to sit on, but it deforms easily and squishes down.
Hard foam (high density foam) are less comfortable to sit on, but they are firmer and do not deform easily (do not squish easily).
If a thicker foam is used to provide adequate cushioning for the coccyx (tail bone) then the cushion becomes unwieldly at approx. (3-7) inches thick, for equivalent ARISTA performance.
CUT-OUT in the seat cushion suspends the coccyx in air, ENSURING no-contact with seat surface.
SQUISH-PROOF DESIGN: Sandwich of two layers (DUAL-LAYER, DUAL DENSITY) offers following benefits:
The TOP soft layer is made of open cell, compressible low-density foam, to provide COMFORT.
The BOTTOM rigid layer is made of closed cell, non-compressible, high-density foam, to ensure the bottom layer does not get squished down. This helps maintain a constant airgap of 15- 20 mm between the coccyx and surface of seat, even for a fully compressed seat cushion.
SLIMMER SEAT CUSHION: Dual-layer, dual-density construction results in “slimmer seat cushion”.
Perforated base: for ventilation and better airflow. Ensures cool comfort during summers.
Anti-slip fabric on the base of cushion cover makes cushion slip-resistant on wooden or plastic chairs.
Chair-fasteners : on seat cushions for use on dining table chairs.