Our 15 year old is 6'4" tall and his feet stuck out when he used his old twin bed. We bought this Serta extra long twin bed for him . He likes the pillow top, says it makes the bed much more comfortable than the old twin that had a separate pad on it. At the same time, the bed's support remains firm and our son says he believes he sleeps much better at night with less tossing and turning on the new mattress and foundation. We note our son used to sit at his desk to do his homework, but now he sits on the bed to do it, so it must be comfortable. 5 stars for sure on this Serta extra long twin bed set.