Use this quality mattress with a platform bed or existing box springs, and never worry about turning this foam mattress. The twin size memory foam mattress is compressed for shipping and includes antimicrobial qualities and a structure that is resistant to dust mites.
Thank you for your inquiry regarding the 20 year warranty for the Spinal Response 7" Twin sized Memory Foam Mattress. That is a limited manufacture warranty that covers defects in workmanship and materials, loose or broken parts not caused by improper care or product abuse. and body impressions of more than 1 ½ inches on all sleeping surfaces. I hope this answer helps you.