Each camel foot has two long, bony toes with tough, leathery skin between. The soles are a little like webbed feet and won't let the camel sink into the soft, drifting sand. Camels have special muscles in their nostrils that close the openings, keeping sand out but still allowing enough air to breathe. Because of the way they sway from side to side when trotting.
Some riders get seasick.
Camels sway from side to side because of the way their legs work. Both legs on one side move forward at the same time, elevating that side. This is called pacing. Camels don't get thick knee pads because they fall on their knees to lie down. They fall on their knees because they already have thick knee pads.