2 Twin XL = One King on a Serta movement bed

My wife and I were paired to the Pranasleep bed through a mattress/furniture store that uses Bridgeit A computerized/mechanical system that sorts out your pressure points and determines the best mattress for you. I can say, three years later. It worked. We switch out or turn the mattress from top to bottom twice a year and so far they look and feel like brand new. Very impressed with the quality now three or four years in. We would buy again when/if needed down the line. Highly recommend these mattresses for a base that is moveable. Only con is they need to put handles on them....that is a must! Very tough to move/switch them around without handles.