So cholesterol is a steroid, which means it is composed of four fused hydrocarbon rings. Now, on one side of those four rings, we basically have a tail that is hydrophobic. So this hydrocarbon chain, on the other side, we have a polar group. And this is the hydroxyl group that makes this molecule very, very slightly polar. So the predominant region of this cholesterol is in fact nonpolar. And this entire section will be found inside that membrane.