The mattress may not have reached a full 8", but it's working. I bought a second one for a trundle, and the size is perfect. My oldest daughter liked it at first, but didn't care for the foam compared to her older spring mattress. She thought it was a little too soft when turning over at night. No worries, we gave this mattress to our younger child who likes a softer mattress, and she has slept well on it. She likes to sleep on her tummy, so I was worried it was too soft, but she's had no issues.