Be *very* careful buying a mattress from w00t. I did and I regret the purchase to this day.
My experience with a previous woot mattress:
The "memory foam" makes a one foot crater where your buttox is. The rest of you is propped up. Now think about your posture sitting on your side, with your back all at an extreme unnatural angel. Seriously, I would have rather sleep on packing peanuts inside a garbage bag. It was a surreally bad mattress - oh which also smelled of horrible chemicals for weeks..
w00t offers no refunds. Buying a mattress from w00t is, without a question, the worst w00t purchase I ever made. Be careful