Wood GREENGUARD GOLD CERTIFIED: The TipToe has undergone rigorous scientific testing for over 10,000 chemical emissions and VOCs. It contributes to cleaner indoor air, creating a healthier environment for your baby to sleep, play, and grow. GROWS WITH BABE: TipToe's versatile design allows the bunk bed to easily split into two twin size beds, and the ladder can be placed on either side to work with any room configuration SAFE FOR BABE: We go the extra step to ensure your babe's safety. Finished in a non-toxic multi-step painting and staining process that is lead and phthalate safe which exceeds ASTM International and U.S. CPSC safety standards UNIVERSAL MATTRESS FIT: TipToe fits a standard twin-size bed mattress (sold separately, box spring not required, maximum thickness of top mattress should be no more than 6") COMPLETE THE ROOM: Pairs with the Universal Twin Storage Trundle Bed (sold separately) for even more sleeping and storage options