18-10-45
The 18-10-45 uses two layers of responsive hybrid foam. A firmer layer on top, and a softer variation in the middle. This effectively adds firmness and support but maintains a certain level of pressure relief. It’s finished with one of the highest-density foam cores available on the market.
Mattress purchase includes free delivery and our 30/90 Commitment.
Sleep hot? Learn how KülKōte keeps you cool.
Meet the 18-10-45.
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A distinctive foam that provides great pressure-relieving benefits, it also adds the firmness and support traditionally associated with this kind of medium/firm hybrid foam.
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Designed to deliver better support and more bounce than memory foam — while simultaneously allowing far better pressure relief than latex or springs — this Responsive Foam is truly the best of both worlds. With a mid-range firmness rating, it’s an unorthodox transition layer that is uniquely equipped to supply pressure relief while maintaining support.
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An additional 2" of Ventilated Rebound Foam adds the perfect balance of pressure relief and airflow, ensuring long-lasting, cooling comfort.
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With a foam that’s 75% more dense than a typical foam mattress core, our 2.8 density foam core is built to last. The 45 IFD (which is the measurement of firmness) provides a medium-soft feel.
Twin = 39"x75"
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Twin XL = 39"x80"
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Full = 53"x75"
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Queen = 60"x80"
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King = 76"x80"
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Cal King = 72"x84"
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Twin = 39"x75" | Twin XL = 39"x80" | Full = 53"x75" | Queen = 60"x80" | King = 76"x80" | Cal King = 72"x84" |
Beyond Basic Warranties
The 30/90 Comfort Commitment
We won’t rest well until you do. Instead of just refunding your money if you’re unhappy, we’ll use 120 days to rebuild a custom mattress that works for you. And if we can’t, then we’ll refund you.
The Forever Partnership
Sometimes, warranties don’t cover what you need. From the date of purchase, we provide a partnership that ensures you’re satisfied. Forever.
Density Means Durability.
Ever seen a foam mattress with a big, body-shaped indent in it? That’s almost all because of the use of low density foams. But it’s not just the top layers of the mattress that need high densiy foam.
Oftentimes, mattress manufacturers will use quality, high-density foam in the top layer or two of a mattress (the parts you feel), then opt to use low-density, cheap foam in the base layer of the bed in order to cut costs. As a result, a cheap, low-density base is almost always to blame for body impressions, not the top layers. The foam simply isn’t made to last and will collapse with very little use.
1.5-1.8 lbs/ft³
(Most Foam Mattress Cores)
Nearly all bed-in-box mattresses found online use foam with a core density in this range, and most of those are closer to the low end of the range. They may feel the same as higher-density foams because density does not equal firmness. They won’t always feel the same, though.
Over time, these foams will lose 35% of their firmness and 5% of their height.
In other words, they create body impressions and get softer faster than higher-density foams. But they’re far less expensive, which makes them very attractive to other mattress retailers, who hardly ever even tell you the density of the foam they use.
2.8 lbs/ft³
(Comfort Option Foam Core)
Comfort Option uses foam with a 2.8 density, a level quality that is unmatched by our competition. This foam is nearly twice as dense, and in our internal tests, performs nearly 5x better than 1.5 density foams in terms of height loss.
Over time, our foam only loses less than 20% of its firmness and less than 3% of its height.
We’re transparent with the foam we use and call our products “Honestly Crafted” for that reason. We use the most quality foams in the industry and therefore are excited to offer as much information about our specifications as we can.
What is KülKōte?
An advanced phase change material that regulates your temperature as you sleep. Available on all Comfort Option® mattresses.
KülKōte is a Phase Change Material.
KülKōte is a water-based, polymer coating that uses micro-capsules that continually changes phases from liquid to solid in order to effectively manage heat energy. We spray it right onto the surface of the foam on the top layer of our mattresses, along with the surface of our SoftFlo® pillows.
“I got a Casper thinking that it must be popular for a reason and I returned it in under 3 weeks because it started giving me back pain. I went to Reddit and heard about this place from their Wiki which prompted me to look into it. I bought a custom mattress without ever trying it in person and I’ve been very impressed with the product, the process and the customer service. We also got some pillows which have proven great for a side sleeper!”
