booster cushion

For children between 1 and 4 years old, an appropriate child seat, or a booster cushion with the adult seat belt, must be used.

A booster cushion raises a child up so that she can safely use an adult seat belt or a child harness.

Children aged 1, 2, or 3 must use a child restraint (or an adult seat belt with a booster cushion) if fitted.

So while backless booster cushions are better than using no child seat at all, they do not provide adequate protection in all circumstances.

Such systems include separate child-sized seats with their own restraints and booster cushions for children using adult restraints.

I'd probably rent booster cushions for an extra fiver, but I already find top price tickets hideously expensive and I refuse to go along with this deeply cynical move.

She places the cat basket on a couple of booster cushions on the front passenger seat, so that the cat can see where it's going, with the seat belt clicked in place for safety.

Although we had very good seats in the stalls, a row of rather large grown-ups in front threatened to block the children's view - until we discovered that booster cushions are available for children on request, which sorted the problem.