Zinus 18 Inch Premium SmartBase Mattress Foundation, 4 Extra Inches high for Under-bed Storage, Platform Bed Frame, Box Spring Replacement, Strong, Sturdy, Quiet Noise-Free, Queen The Premium 18 Inch Smart Base eliminates the need for a traditional box spring and bed frame. Queen- 80 x 60 x 18 inches 18 Inch high with 17 Inch of clearance under the frame for 4 extra Inch of under bed storage space Strong, steel mattress support / Low-Stress, Easy Assembly in minutes with no tools required Folding design allows for easy storage and movement through tight staircases and doorways Requires the use of SmartBase headboard brackets to connect to a headboard