Hummer 2006 H2 - Manual (Page 35)

The safety belt locks if there is a sudden stop or a
crash. The safety belt also locks if you pull the belt very
quickly out of the retractor.
{ CAUTION:
You can be seriously hurt if your shoulder belt
is too loose. In a crash, you would move
forward too much, which could increase injury.
The shoulder belt should fit against your body.
To unlatch the belt, push the button on the buckle.
Rear Safety Belt Comfort Guides
Rear shoulder belt comfort guides may provide added
safety belt comfort for older children who have outgrown
booster seats and for some adults. When installed on
a shoulder belt, the comfort guide positions the belt
away from the neck and head.
Comfort guides are provided for each passenger in the
second row seat and one guide for the single third
row seat. Here is how to install a comfort guide and use
the safety belt:
1. Remove the guide from its storage clip on the trim
panel near the side of the seatback or from the side
of the seat.
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