THE FOLLOWING VERBAGE (724-E and 724-H) HAVE BEEN MODIFIED FOR THE 2009 USAC .25 Midget COMPETITION RULES. THIS NEW RULE WILL BE IN EFFECT AS OF MAY 15, 2009.
A. Cars must have a web type safety belt with quick release buckle. Safety belt must be securely fastened to the frame. Pull up lap belts are recommended.
B. Use of safety belt is required at all times, and belt should be worn as tight as possible.
C. Seat belt must be worn in such a manner that it passes around the pelvic area at a point below the anterior superior iliac spine. Under no condition may it be worn over the area of the intestines and abdomen. (Lap portion of safety belt must be located so that pressure is across driver's hips)
D. Metal quick release is preferred
E. Minimum of a five point safety belt is mandatory.
F. Double Shoulder straps are mandatory. They must be worn securely across the right and left shoulders, and should be worn as tight as possible.
G. No restraining device may be used to keep the drivers head or body outside of the roll cage.
H. Anti-Submarine belt mandatory as of May 15, 2009.
I. Both the fastening design and condition of the straps are subject to the inspection of the Technical Committee.
J. Shoulder straps must be attached directly to a strong structural member of the chassis close behind the driver's head and neck.
K. Life of the belts in use shall not exceed four (4) years and must be date stamped by the manufacturer.
L. Aluminum seats may be used. The seating system should provide a lateral support on both the left and right sides. It is recommended that the seat provide left and right lateral support for both the shoulders and head.
Per SFI Program here is the verbiage from Spec 16.1 regarding anti-sub straps:
Anti-Submarine Strap: A belt assembly intended to prevent slippage of the pelvic region forward from under the lap belt during any condition producing a forward pelvic load. This strap can have various configurations. It can have a single mounting, with the other end attached at the buckle (five point) or it can be mounted at both ends with the attachment to the buckle between them (six point).