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The following excerpt is taken from:
[Code of Federal Regulations]
[Title 49, Volume 5, Parts 400 to 999]
[Revised as of October 1, 1998]
From the U.S. Government Printing Office via GPO Access
[CITE: 49CFR571.209]
Sec. 571.209 Standard No. 209; Seat belt assemblies.
Most recent available citation: CFR Title 49, Part 571, Section 209 (text)

(g) Adjustment.

(1) A Type 1 or Type 2 seat belt assembly shall be capable of adjustment to fit occupants whose dimensions and weight range from those of a 5th-percentile adult female to those of a 95th-percentile adult male. The seat belt assembly shall have either an automatic-locking retractor, an emergency-locking retractor, or an adjusting device that is within the reach of the occupant.

(2) A Type 1 or Type 2 seat belt assembly for use in a vehicle having seats that are adjustable shall conform to the requirements of S4.1(g)(1) regardless of seat position. However, if a seat has a back that is separately adjustable, the requirements of S4.1(g)(1) need be met only with the seat back in the manufacturer's nominal design riding position.

(3) The adult occupants referred to in S4.1(g)(1) shall have the following measurements:

(g)* * *

(3) The adult occupants referred to in S4.1(g)(1) shall have the following measurements:

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                            5th percentile     95th percentile

                              adult female        adult male

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Weight.......................... 102 lbs........... 215 lbs.

Erect sitting height............ 30.9 in........... 38 in.

Hip breadth (sitting)........... 12.8 in........... 16.5 in.

Hip circumference (sitting)..... 36.4 in........... 47.2 in.

Waist circumference (sitting)... 23.6 in........... 42.5 in.

Chest depth..................... 7.5 in............ 10.5 in.

Chest circumference:

Nipple........................ 30.5 in........... 44.5 in.

Upper......................... 29.8 in........... 44.5 in.

Lower......................... 26.6 in........... 44.5 in.

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