Fashion Bed Group Pop-Up 39-Inch Poly Deck Trundle Bed with Dual Gravity Locks, Twin Poly deck trundle that's spring-loaded to safely "pop" open when needed Locking spring automatically lifts the unit into the "up" position and locks into place Gravity locks ensures stability when the trundle is in the "up" position Allows for safe, controlled closing for storage Protected with a 1-year limited warranty against manufacturing defects