Graco FastAction Fold Owner's Manual page 80

A snug harness should not allow any slack. It lies in a
relatively straight line without sagging. It does not press
on the child's flesh or push the child's body into an
unnatural position.
4. Pull All the Slack
Out From Around
the Waist
Pull up on the harness
strap while pushing
the chest clip down.
Do this to both sides.
5. Tighten the
Harness by
Pulling the
Harness
Adjustment Strap
When you are not
able to pinch any of
the harness webbing
at your child's
shoulder, the harness
is tight enough.
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