Well it's not always the same. It depends on my state of mind at the time, I don't think it is touching my physical bodies feet I think it is touching one of my subtle bodies feet area. I believe this because when I am deep into meditation it feels a lot different from when I am in my physical body. When I am in my physical body it will often feel like a slight touch barely noticable or it will feel like a muscle spasm. I believe this has something to do with the energy/electricity which is being transferred

Anyways when I am deep into meditation or my consciousness is inside of one of my subtle bodies I can actually feel every finger on it's hand. It feels like extremely cold hands smacking, slapping, flicking, pinching, scratching, or squeezing my feet.