SagsAway Sagging Mattress Support | Fix Visible Body Sag | Extend Mattress Life (Standard (1&rdquo;) x20&rdquo;x27&rdquo;) Follow 3 Steps and Watch Video (Before You Order) to ENJOY renewed COMFORT and SUPPORT. You target the actual size and depth of a visible sag. DIY solution: You measure sag depth - determine thickness of support needed. INNERSRING or LATEX mattress only. Targeted Sag Support for a GREAT NIGHT SLEEP. Many say they avoid morning back pain from not sleeping in a sag. Not a medical device for chronic back ailments. Try One  Test Results to delay buying a new mattress. Instructions and phone help included. STEP (1) Know what Type of Mattress you have. DOES NOT WORK on Tempurpedic, Solid Memory Foam, air, water or sofa bed mattress. Hybrid mattresses are more challenging. Memory foam will be non-responsive as support is absorbed rather than transferred. STEP (2) Measure your sag depth using a yardstick and tape measure as shown in photo. Inserts between your mattress and box to directly TARGET the visible sagging area (not entire mattress) on an INNERSPRING or LATEX mattress up to 14" thick. Made in USA STEP (3) Choose 1" thick Standard (or) 1 " thick Standard Deep, a 2-ply foam. Level the sleeping surface  dont create a hump. Choose the thickness that matches sag depth. One insert per sag. Amazon handles returns within 30 days - less return shipping WORKS WITH Innerspring and Latex mattresses up to 14 thick only. DOES NOT WORK on Tempur-Pedic, Memory Foam mattress, air, water or sofa bed mattresses because the effect of the support is absorbed rather than transferred. While some have success with Hybrid Mattresses made with a top layer of memory foam, positive results are more challenging. WORKS WITH<span class="a-text-bold"> </span>boxsprings, platforms, and similarly designed bases DOES NOT WORK<span class="a-text-bold"> </span>on bunkie boards. These are usually foam and would have the same issue as a foam mattress. DOES NOT WORK for sags much less than 1 or much over 2 deep. Start with one insert for each sag or person then add more. The 1  thick is a heat fused 2 ply material.