Why bring them? They will save you from h@$%. With out them, your foot will be covered with blisters. But they will only do that if you wear them right.

What kind should I get? This is very important. So pay attention. You need a thick wool sock (for padding and warmth/cooling). You also want to get a pair of thin, synthetic fiber, liner socks such as ULTIMAX™ hiking liners. You put the wool socks over the liners and the liner will act as a lubricant for your foot (reducing friction). The wool socks are absolutely necessary even in the desert. You might think that they make your feet too hot. But, they actually keep your feet comfortable at any temperature (except below freezing).