I bought twin platform beds from Wayfair. (love them)...My daughter had 2 twin box springs but only 1 mattress, so I needed 1 more mattress to complete my set. I measured her existing mattress and ordered the 10" so they would "match" as a set. It was PERFECT. Nice and firm and will ensure great support. It inflated quickly, easily and evenly...no mildew, no smell.  I think it is every bit worth the 5 stars.