Take those stinky sneakers off and put on some slippers!
Local pronunciation: sleeppahs, Pidgin: zoris

Explanation: 
Sand and other nasty stuff gets in easily, but it also gets out easily.
It's a big hassle with sneakers and stockings.
Consider the ventilation too :-)!
It's not an absolute rule though. If you climb rocks,
or you walk on lava, etc. shoes or boots are appropriate.

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