This section provides description for some common terms that will be used throughout the document 5 Point / 6 Point Harness: A seatbelt with 5 or 6 belts in total. It restrains the movement of the occupant more than a 3 Point Seatbelt and is safer 5 Point Harness  1 & 2: Shoulder Belts 3 & 4: Lab Belts 5: Anti Sub Belt
6 Point Harness Passthroughs: Cutouts in the seat to allow the belts of a 5 or 6 Point Harness to pass through the seat uninterrupted (as shown by the red circles in the image below)
Seatback: The portion of the seat which supports the back and shoulders of the occupant Headrest: The portion of the seat which supports the head and/or neck of the occupant Seatpan: The portion of the seat which supports the buttock and upper leg of the occupant Bolsters: Protrusions/barriers typically found on the seatback or seatpan of the seat (shown by the red circles in the image below) They keep the occupant centered in the seat during cornering.  Â
Undepressed Seat Contour: The shape of the seat cushioning (typically viewed from the side) when no occupant has sat in it Depressed Seat Contour: The shape of the seat cushioning (typically viewed from the side) when an occupant is sitting in the seat - causing the cushioning to compress ILD/IFD: Acronym for Indentation Load Deflection or Indentation Force Deflection. A test to determine the stiffness of a foam. Manufacturers will typically specify the stiffness of their foam in ILD/IFD In this test a circular flat indenter is pressed against a foam sample of standardized width, length and height. 60 seconds after the indenter has achieved 25% or 50% compression, the force is measured Higher ILD/IFD values = stiffer foam 25% ILD/IFD is for a 25% compression 50% ILD/IFD is for a 50% compression US measurements are in pounds-force European measurements are in newtons
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