There's a schedule of pay bumps for overtime, for night shoots, for very-late night shoots, for wet work (rain or snow), for smoky work (cigarettes or manufactured haze) and, on some productions, for showing up in wardrobe that's out of sync with the seasons say, shorts and sandals for a beach scene in the dead of winter.

WSJ: Life in the Background | By Joanne L. Kaufman

The simple sandals can also shield feet against the beach's hot sand, which might otherwise cause skin to burn and blister on your walk to the water.

CNN: Flip-flops present feet with a painful problem