Due to a tendon and possibly ligament damage in the upper shoulder area on the arms I had increasingly great difficulty in finding enough on a conventional mattress sleep - especially because any sleeping position and any position change was associated with unpleasant pain. In my search for remedy and relief I found on the Internet on the term "viscoelasticity" and learned that this extremely resilient material has been developed in the context of spaceflight. To make it short: "Try before" - and so I chose because of my tenderness a slightly thicker viscoelastic mattress pad, which also has a cover made of pure cotton. The reviews on the net to the other sizes are mostly good to very good and thus qualify the risk of failure purchase considerably. My assessment has proved to be fully correct, the ordered mattress was shipped free the next day. After I had freed the constrained in a plastic bag mattress from their tight encirclement, I experienced a "metamorphosis" of the material. Like a butterfly - after the liberation from its cocoon -, unfolded and smoothed out the rest as if by magic within moments and was completely flat on the mattress that you should not remove the grounds of total comfort. Not wrongly declares the supplier of a "mattress". And now the most important thing: How is resting and sleeping it "viscoelastic"? In a word: Heavenly! I can again slumber so symptom-free and I rotate freely and without pain in bed and turn that it is a pleasure - as in "Abraham's bosom"! For men featuring the slogan "be praised, which makes hard" follow, is recommended to use this very useful aid in the mentioned or similar sleep problems here. It is very soft, for some at the beginning may get used to. But the immediate benefits are so convincing that you should this additional convenience to which one does not want to get used quickly and miss afford. At least, personally my assessment. In addition, the entire mattress is not just soft, but allowed by the viscoelastic effect a balanced sleeping and lying position with selective pressure relief, so that especially the spine remains straight. The result is relaxed sleep! Conventional bedding warp relatively strong, due to the viscoelastic structure of the mattress. Fitted Sheets minimize the "crumpled" effect - ie drape - significantly and are highly recommended. The advantage - they can be quickly and easily re-draw smooth. Especially because they have a tendency of lateral elastic band less likely to "wrinkling" - if you know what I mean. Whether an additional mounted on the bearing softer mattress protectors (so is not the schooner between slats and mattress meant that consists of a very strong material) is necessary, everyone must decide for themselves. I have tried both, for reasons of hygiene makes such an additional circulation sense. In connection with the viscoelastic mattress follows to my mind a slightly less significant pressure relief, but perhaps I am mistaken, the difference seems to be marginal. All other facts and figures available on the Internet. I can recommend the viscoelastic mattress very. My tip: buy!