If you are buying a mattress online, check out IKEA's collection. Not only will you find variety, but the material used is also soft to the touch. The overall make of IKEA mattresses offers comfort and is designed to suit your sleeping style. You can find:
Single mattresses
Double mattresses
Queen-size mattresses
King-size mattresses
Matress.
I would go with a very thick and firm mattress pad to compensate for dips in the mattress.
You can buy a Water-Proof matress pad in case of night time accidents. Simply place the cover over the matress, and cover it with a normal bedsheet. When accidents occur, the matress pad can be washed and will protect the matress itself.
a matress is because a matress is soft and concrete is hard
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A tempur pedic matress is very costly and can range from the low thousands to the tens of thousands per matress. It is best for you to visit their home website for Tempurpedic to see if any are what you seek and it will allow you more information on their products.
Land on something soft like a matress or water
Know the size you want. Also do not skimp on the matress as you will be stuck with it for years.
The only purpose of a mattress pad is to protect the mattress. Do as you please.
Supima mattress pads are very durable and should last many years.
It would be best to use with a normal matress or one that is turned off.
A latex or memory foam matress is best for any size body even if still growing.