A softside mattress has sloping sides and is to be placed in an insulating foam frame. The measures orderedare the outer measures of the bed incl. foam frame. A water mattress from Akva Waterbeds is made ofphthalate free vinyl, certified to OEKO-TEX 100 and free of any harmful substances. On the backside of your present water mattress label you can find more information regarding size and stabilisation.