We love this bed frame! We bought it for our boys. We did not know there was a difference in twin size mattresses. My boys have a twin XL. So my husband had to drill 2x4 to the bottom of each side for the under bed to be able to fit lol we made it work!! Also this is our first purchase from Wayfair and it was SO EASY. To put together! I love how every piece is numbered! Made life so easy! Thank you!