I have bought kurl-on matterss april 16. Kurl-on is brand, inspite of it is not comfertable as we thought.i donot know which type of mettreal inside the mattress, at night it was so hot and irriteting.i had to keep another thin cloth type mattrss on kurl_ on.other wise we cant sleep on it.it is very discomfort.for summer it is very bad and in winter season u can use it with the help of another cloth mattrss.accordind to cost it is not comfertable.compney should take attetion towsrds this type of mattress.