how are blood vessels under the feet not compressed to the point of blockage when standing?
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Most of the blood vessels in your feet is deeper in your foot. The underside of your foot is a thicker layer of skin and then layers of harder fat so that the weight gets distributed into your bones without compressing the blood vessels. You still do not get around the issue though as there is some smaller blood vessels that need to supply the skin and fat with blood. Again the thicker skin helps as the blood only needs to get to the inner part of the skin. And in general skin and fat does not need much blood anyway, not like muscles or inner organs. Your cells do not need a constant flow of blood but can handle shorter disruptions in blood flow. Although not recommended your extremities can be without blood flow for up to 15 minutes without needing treatment. But skin and fat can usually last much longer then this. It is however almost impossible to stop blood flow completely. And you do not tend to stay completely still for longer periods of time either and will move around a bit. The problem you are describing is however an issue in certain environments, for example on airplanes where the seats are tight and does not allow for much movement.
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