We're fussy about our mattresses. We could lecture you on the proportion of your life that you spend in bed, but instead we simply say: Trust OKA quality and know that when you buy one of our beds you are buying an English-made, fully pocket-sprung mattress on a sturdy base. To keep your mattress in premium condition, rotate the mattress 180° after 3-4 weeks so the head becomes the foot, then 3-4 weeks later, flip the mattress so the bottom becomes the top. Repeat this cycle every 3-4 weeks.