A flotation device used as a recreational swimming aid, especially by young children and older persons who cannot swim. So called because it resembles (and in earlier times, usually [i]was[/i]) the inner tube of a car tire.

On Danbooru, often constructed of [[transparent]] material, ostensibly for better visibility of the wearer.

A [[lifebuoy]] is visually similar, but its use and usual material composition are different.

h4. See also
* [[inflatable toy]]
* [[doughnut innertube]]
* [[duck innertube]]
* [[watermelon innertube]]
* [[innertube with ears]]
浮き輪 うきわ 浮輪 游泳圈