Plank Mattress — 4 Years Old
Firm Side
Egg crate foam + padded cover
Extra Firm Side
Like sleeping on the floor
The Cover
Cover is in great shape. No pilling, no rips, nothing torn. Pretty high quality cover. Some scuffs from me dragging it around but otherwise looks very much intact. The firm side has a bit more padding in the cover to give you slightly more cushion. The extra firm side has basically nothing — just a thin cover.
Body Impressions & Sagging
Checking the firm side for body impressions — this is the side they slept on
Very minimal body impressions. Slight impression near the head area but otherwise this mattress is extremely flat. No sagging whatsoever — which means the support foam is completely intact. The structure of this mattress is still very much there after 4 years.
The person who got rid of this mattress didn't get rid of it because anything was breaking down. They got rid of it because it was too firm. That's common — a lot of people think they want a firm mattress, but what they actually want is a supportive mattress.
The Two Sides
This is a two-sided (flippable) mattress. One side is "Firm" and the other is "Extra Firm." Let me break down what that actually means.
Firm Side (~7.5-8/10)
Testing the firm side — this is the side they slept on
I'm laying on it and I feel like I'm sitting on top of the mattress. Not sinking in much at all. It's comfortable but very firm — I'd say this is about as firm as I would ever go on a mattress. For back or stomach sleepers who want firm, this works. Side sleepers? Your arm is going to fall asleep.
Extra Firm Side (~9-10/10)
Testing the extra firm side — like sleeping on the floor
The extra firm side — basically just the support foam with a thin cover
This is like sleeping on the floor. A little bit bouncier than the floor, but not by much. You're basically sleeping directly on the high-density support foam. I don't know who would want to sleep on this, but I had a friend growing up who loved sleeping on the floor — he'd probably love this. If the firm side isn't firm enough for you, flip it over. If THIS side isn't firm enough, then just sleep on your bed frame.
Edge Support
Sitting on the edge to test support
I barely sink at all when I sit on the edge. That's a very high-density support foam that's still completely intact after 4 years. Most all-foam mattresses I test, the edge collapses when you sit on it. Not this one. The support foam is doing its job.
The Foam Layers
Cutting it open to see what's inside
This is a simple mattress — and that's not a bad thing. Fewer layers means fewer things that can go wrong.
Firm Side Construction
Breaking down the layers on the firm side
The firm side has a base layer of very firm support foam, then a thin layer of egg crate foam on top. I don't see egg crate foam that often — it's an interesting choice. For a firm mattress like this, it gives you just a little bit of cushion without the thickness you'd get from a full foam layer. The cover also has some padding built in.
Extra Firm Side Construction
The extra firm side is even simpler: just the high-density support foam with a very thin cover on top. That's it. You're sleeping on the support foam. No comfort layer at all.
Layer 1: High-Density Support Foam (Core)
This is the base — and in this mattress, it's doing most of the work. Very high-density, still very much intact after 4 years. When I push into it, it pushes back hard. This is quality support foam — not the cheap stuff that turns to mush.
Layer 2: Egg Crate Comfort Foam (Firm Side Only)
This is a thin layer of egg crate foam that gives the firm side just a bit of cushion. It's not thick — maybe an inch. The egg crate design gives you some pressure relief without adding much softness. Still doing its job after 4 years.
Fiberglass Check
No Fiberglass
Brooklyn Bedding doesn't use fiberglass in any of their mattresses. Made in the USA.
A lot of budget mattresses use fiberglass fire socks to meet fire safety standards. The problem is those cheap fire socks can break down and release fiberglass particles everywhere. Brooklyn Bedding makes all their mattresses in their own USA factory and doesn't use fiberglass.
Available Sizes
About 10 inches thick
The Plank is available in a wide range of sizes including odd sizes and RV sizes. Brooklyn Bedding also makes a hybrid version (Plank Firm Luxe) with pocketed coils if you want some bounce.
Standard Sizes
Odd & Specialty Sizes
RV Sizes
Need help finding your size? Check out my guides:
Who This Mattress Is For
My final thoughts on who should consider this mattress
Good For
- People who genuinely want the firmest mattress possible
- Back sleepers
- Stomach sleepers
- People with back pain who've been told to try firm
- People who currently sleep on the floor
- People who tried other "firm" mattresses and found them too soft
Not For
- Side sleepers — your shoulder and hip will have no pressure relief
- People who think they want firm but actually want supportive
- Couples with different firmness preferences
- Anyone who wants any "sinking in" feeling
Let me be clear: most people who say they want a firm mattress don't actually want THIS. This is true firm. You will feel like you're sleeping on a plank — that's literally the name.
If you want a mattress that doesn't sag, that's supportive, that doesn't make you feel like you're falling into a hole — that's different. That's a supportive mattress with good support foam. You can get that without going this extreme.
But if you genuinely want the firmest thing possible, if you've tried other "firm" mattresses and they felt too soft, if you currently sleep on the floor and want to upgrade slightly — then yes, this is your mattress.
My Take
This could be the firmest mattress I've ever torn open. I'm kind of a mattress nerd, and I was genuinely curious to see what they put in here. The answer: very high-density support foam and minimal comfort layers. That's how you get this firm.
The construction is solid. Nothing cheap about it. After 4 years, nothing is breaking down — no sagging, minimal body impressions, edge support still great. The person got rid of it because it was too firm, not because it failed. That tells you everything about the quality.
I'd expect this mattress to last 10+ years easily. There's barely any comfort foam to break down. You're basically sleeping on the support structure.
If you truly want firm — not "supportive," not "doesn't sag," but genuinely FIRM — this is your mattress. Just make sure you actually want that before you buy it.