CHEVROLET 2010 Silverado - Manual (Page 80)

To make the belt shorter, pull its free end as shown until
the belt is snug.
If the belt is not long enough, see Safety Belt Extender
on page 2‑38.
Make sure the release button on the buckle is
positioned so you would be able to unbuckle the safety
belt quickly if necessary.
Safety Belt Extender
If the vehicle's safety belt will fasten around you, you
should use it.
But if a safety belt is not long enough, your
dealer/retailer will order you an extender. When
you go in to order it, take the heaviest coat you will
wear, so the extender will be long enough for you. To
help avoid personal injury, do not let someone else use
it, and use it only for the seat it is made to fit. The
extender has been designed for adults. Never use it for
securing child seats. To wear it, attach it to the regular
safety belt. For more information, see the instruction
sheet that comes with the extender.
2-38