Have the person use a "doughnut cushion" (from a medical supply store) or small inflatable inner tube when sitting.

Three thick layers of foam surrounding an inflatable tube.

In this game robots were required to place inflatable tubes onto a central structure called "the rack" in the middle of the field.

An inflatable inner tube is built into the racquet's head.

'Snowtubing' is the main activity, where visitors will be sliding down the snow slope while sitting on an inflatable tube.

Running around the outside of the hull is an inflatable tube constructed of tough Nylon weave.

We emerged dazed with a raft full of water, the top of the inflatable tubes just rising above the river.

Instead of a metal frame, the crib has inflatable tubes on each corner that form support columns.

Traveling down the river in inflatable tubes is a popular activity.

The second generation were blocked foam pads, then came inflatable tubes.