HOMBYS Under Mattress Support - 3 High Density Foam Pieces to Fix Sagging, Layered Repair for Mattress Sagging 17x13x1.5 Inches

Product Overview

The Hombys Under Mattress Support includes three foam pieces: two measuring 17x13x1.5 inches and one measuring 17x13x1 inch. These dimensions allow targeted placement under sagging sections rather than covering the entire mattress surface. The foam is high-density for resilience and adequate support. Users can layer pieces for deeper sags or use them individually for minor dips. The foam is cuttable, enabling customization of size and shape to match specific mattress contours. The product ships compressed in a box and requires 24-48 hours to fully expand after unpacking. It is designed for adult use and works with various mattress types. Some users note the foam pieces do not cover the full mattress width or length, focusing only on problem areas. The lightweight design at 14 ounces makes handling and placement straightforward. The manufacturer emphasizes this as a cost-saving alternative to mattress replacement.

Design & Build

The Hombys Under Mattress Support features a simple yet functional design centered around three rectangular foam pieces. The foam is high-density polyurethane, providing the firmness needed to support mattress weight without compressing excessively. Each piece measures 17 inches long by 13 inches wide, with thicknesses of 1.5 inches for two pieces and 1 inch for the third. This thickness variation allows users to address different sag depths. The foam has a uniform cell structure that contributes to its resilience and durability. The rectangular shape is practical for most sagging areas, particularly along mattress edges or in the center. The foam surface is smooth and firm, without covers or fabric layers that might shift during use. The material is firm enough to provide substantial support yet flexible enough to conform slightly to mattress contours.

The build quality focuses on functionality over aesthetics, as the foam pieces remain hidden beneath the mattress. The foam is cuttable with standard scissors or utility knives, allowing customization for irregularly shaped sags or smaller mattresses. Some users report the foam maintains its shape well over time without significant compression or degradation. The pieces are lightweight at 14 ounces total, making them easy to handle and position. There are no mechanical parts, adhesives, or fasteners included—installation involves simply sliding the foam pieces between the mattress and bed frame. The foam is not treated with fire retardants or other chemicals that might affect indoor air quality. Cleaning involves simply wiping with a damp cloth if necessary. The product ships compressed to reduce package size, requiring a full day or two to regain its intended dimensions and firmness.

Performance

Reviewers report the Hombys Under Mattress Support effectively reduces or eliminates mattress sagging when properly positioned. Users describe immediate improvement in mattress firmness and sleep comfort. Many note significant relief from back pain that had developed from sleeping on sagging surfaces. The foam provides adequate support to prevent the mattress from dipping in problem areas. Some users mention needing to experiment with placement to find the optimal position under the sag. The high-density foam maintains its supportive qualities without bottoming out under body weight. Multiple reviewers describe the product as restoring their mattress to a near-new feel. The foam pieces stay in place reasonably well without sliding, though some users suggest checking placement periodically. The targeted approach means only affected areas receive additional support, preserving the mattress's original feel elsewhere.

Performance varies based on sag severity and proper foam placement. For minor to moderate sags, users typically achieve satisfactory results with one or two foam pieces. Deeper sags may require layering all three pieces for sufficient height. Some reviewers mention the foam compresses slightly over time but remains functional. The product does not address mattress issues beyond surface sagging, such as broken springs or structural damage. Temperature and humidity do not significantly affect foam performance in typical bedroom conditions. There is no noticeable odor after the initial expansion period. The foam does not create noise or friction sounds during movement. Users appreciate the non-invasive nature of the solution compared to mattress toppers or full replacements. The product performs best when the sag is localized rather than spread across the entire mattress surface. Many reviewers consider it a temporary fix that can extend mattress life by several months to years.