A smart mattress and smart base are actually two separate purchases meant to be used together. Screenshot Personal Comfort App via Julia ForbesI opted to test the Rejuvenate with Personal Comfort’s Power-Flex 4 base, which is the most feature-rich base the brand offers. You don't have to buy an adjustable base from Personal Comfort, but the brand often runs bundle promotions. The Personal Comfort app can help bypass all this clutter and fumbling in the dark. Personal Comfort is currently running a promotion in which you can get a free BedJet 3 cooling system with your purchase.