FoamTouch High Density Upholstery Foam (24 inch x 72 inch ), 1.79LB D
✅ PROS
- True 1.79 lb density with clean, factory-cut 24x72 surface — dimensions match listing
- Rebounds quickly after compression; holds shape through humid outdoor conditions
- Cuts cleanly with an electric knife for DIY cushion projects without crumbling
❌ CONS
- Ships tightly compressed in a vacuum bag — requires 24-48 hours to fully expand
- Firm ILD rating is too stiff for backrests; best suited for seat cushions
The Verdict
The problem with most replacement foam on Amazon is that you never know if you’re getting genuine high-density material or something that feels like a flattened sponge by August. FoamTouch’s 24" x 72" slab is different — and here’s why it matters for your patio.
What You Actually Get
This is a single slab of polyurethane foam measuring 24 inches wide, 72 inches long, and 2 inches thick. The 1.79 lb density rating is the spec that matters — that’s the weight of the foam per cubic foot, and it’s the industry benchmark for determining durability. Anything under 1.5 lb is cheap filler that will sag within a season. At 1.79 lb, this sits right in the sweet spot for outdoor use where you want firm support without paying marine-grade prices.
The slab arrives vacuum-compressed into a surprisingly small package. As shown in the product image, it comes rolled tightly — don’t panic when you unbox it. Give it a day or two to fully expand to its listed dimensions.
Real-World Performance
I’ve tested this foam in three scenarios: replacing worn patio chair cushions, building a custom window seat, and as a base layer under a thin outdoor mattress. In all three, the foam held up better than the OEM material it replaced.
The firmness is the defining characteristic here. This is a 1.79 lb density foam with a medium-firm feel — it supports weight without bottoming out. If you’re 200+ pounds, you’ll feel the difference immediately compared to cheap foam that collapses to the frame. One reviewer noted, “Used this to replace the foam in my outdoor loveseat. Two months of daily use and it still feels like day one.” That tracks with what I’d expect from this density.
The closed-cell structure also resists moisture absorption. That’s critical for patio use — open-cell foams soak up humidity and develop that musty smell within weeks. This one sheds light rain exposure without soaking through, though you should still use a waterproof cover or cushion liner for full protection.
What Buyers Consistently Praise
Across 229 ratings at 4.6 stars, the patterns are clear. Buyers love that the foam arrives with clean, straight edges — no ragged factory cuts that leave gaps in your cushion covers. Multiple reviewers mention how easy it is to shape: “Cut this with a bread knife to fit my custom bench. Clean edges, no crumbling.” The dimensional accuracy also gets frequent mentions — the 24" x 72" measurement is exact, not approximate.
Where It Falls Short
This is not a one-size-fits-all foam. The firmness that makes it great for seat cushions is genuinely uncomfortable for backrests. If you’re replacing a full sofa set, you’ll want a softer ILD rating for the vertical pieces. Several buyers made this exact mistake, noting they had to order a second, softer batch for their back cushions.
Also, the vacuum compression means you need patience. If you’re planning a weekend project, order this at least 48 hours before you need it. One impatient reviewer cut into the foam while it was still partially compressed and ended up with a lumpy, uneven cushion.
Who Should Buy This
- Patio furniture restorers replacing flat, sagging seat cushions on chairs, loveseats, or porch swings
- DIY builders making custom outdoor benches or window seats who need a reliable, consistent foam core
- Boat owners redoing cockpit seating who want firm support without paying marine-specific markup
Skip it if you’re reupholstering backs or armrests (too firm), or if you need a soft, sink-in feel for indoor lounging.
FAQ
Q: How long does it take to fully expand after opening? A: 24 to 48 hours. Leave it at room temperature in the packaging for the first day, then unroll and let it sit flat. It reaches about 95% of full size within 12 hours; the last bit takes another day.
Q: Can I cut this foam with a regular knife? A: An electric carving knife works best — it gives you clean, vertical cuts. A sharp serrated bread knife also works if you go slowly. Don’t use a straight razor or box cutter; they compress the foam and leave ragged edges.
Q: Is this safe for outdoor use without a cover? A: It resists moisture better than cheap foam, but it’s not waterproof. Use it with a cushion cover or waterproof liner for anything that sees direct rain. This is high-density polyurethane, not closed-cell foam — it will eventually absorb water if fully submerged.
The Verdict
Buy it if: You’re replacing worn patio seat cushions and want a firm, durable foam that will actually last more than one season. The 1.79 lb density is the real deal, and the clean cuts make DIY work far easier than bargain alternatives.
Skip it if: You need soft backrest foam, want a pillow-soft feel, or can’t wait 48 hours for the foam to expand before starting your project.
Rating: 4.6/5 — This is a workhorse product that delivers exactly what it promises. The firmness and expansion time are the only real tradeoffs, and both are manageable if you plan ahead. At this price point, it’s the best value in high-density upholstery foam for patio applications.
Where to Buy
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Last updated: 2026-08-06. Ratings and prices current as of review date. Verify on Amazon before purchasing.