King Koil Review

Updated 3 days ago
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While this is a fantastic mattress at this price point, our #1 pick for 2023 is SAATVA mattress. Saatva is a luxury mattress shipped to your door (unlike other bed in a box brands dropped off on your doorstep) w/ FREE white-glove delivery & setup. They have over 50,000 5-star reviews, and they're incredibly comfortable (for all sleep positions).

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Handcrafted entirely in the USA, King Koil features 7 different mattress collections of varying construction and firmnesses to offer an optimal sleep experience for every sleep style, preference, and need. King Koil mattresses feature advanced cooling technology, innovative zoned coil systems for targeted support, and even include advanced SmartBed technology you can control through your phone.

Pick King Koil if...

  • You're looking for different mattress options. King Koil offers 7 different mattress collections, each with customizable firmnesses and comfort levels. If you're looking for a customizable, luxury sleep experience, King Koil delivers.
  • You love memory foam, but you want to sleep cool. King Koil mattresses use cooling technology in union with the comfort of memory foam. Graphite infused foam layers and their patented Hypur Gel technology provides you temperature control need with the cradling comfort you crave.
  • You want to choose from a variety of prices. King Koil's price range spans from budget-friendly to indulgent, so that you can experience luxury that fits your financial needs.

Seek alternatives to King Koil if...

  • You need a sleep trial period. Each King Koil mattress includes a warranty specific to your purchase, but they don't include a sleep trial. If you think you'll need several nights to decide whether your mattress is a good fit, King Koil may not be the right choice for you. Saatva may be a good alternative as they offer a generous 180-night sleep trial.
  • You want to buy a King Koil online, directly from King Koil. Unfortunately, King Koil doesn't have an online shop, so you'll have to buy your King Koil mattress either through an online or in-store retailer. If this extra step is an inconvenience to you, opt for alternative mattress brands instead like Saatva and Loom & Leaf.


King Koil has dozens of mattress collections and models, resulting in a wide variety of firmnesses suitable for many different sleep needs and styles. Their firmness levels range from ultra plush to extra firm.

  • Ultra Plush: This firmness level is optimal for side and combination sleepers looking for shoulder and hip pressure relief. If you like superior cushioning and feeling more "in" your mattress than "on" it, Ultra Plush caters to this preference.
  • Plush: Slightly firmer than Ultra Plush, this firmness level gives slightly more support while still remaining ideal for side only or combination sleepers.
  • Luxury Firm: This is a medium firmness level ideal for all sleep styles, including back and stomach sleepers. Luxury firm provides the cushioning you crave with the support you need for healthy spine alignment. This is also the most popular comfort level of all Saatva mattresses.
  • Firm: King Koil's second firmest option, their Firm model is best for back and stomach sleepers who still want a mattress that provides adequate give and responsiveness.
  • Extra Firm: King Koil's firmest option, their Extra Firm models provide superior support and weight distribution, optimal for stomach sleepers. You'll feel more "on" than "in" this mattress.

Construction & Design

  • King Koil mattresses range from 11" to 15.5" high.
  • King Koil mattresses provide a variety of hybrid and all foam mattresses within their 7 different collections to suit a wide variety of preferences, needs, and sleep styles.
  • SmartLife Collection: The SmartLife system adapts to your body's size and movements while you sleep for personalized support. Patented body sensing technology responds to your body's needs while you sleep, adjusting to cater to your movements. Each mattress is made with premium memory foam layers, and syncs with your phone for added features. SmartLife models come with a Relaxation Massaging Mode, Sleep Quality Tracking, and a Smart Alarm, all accessible via the King Koil phone app.
  • Intimate Collection: Featuring CertiPUR-US certified memory foam and 2000-4000 Perimeter Zoned Micro-Coils, the Intimate Collection provides a wide range of luxury hybrid models that offer premium support and contemporary design. Each model either features Graphite Infused memory foam, or HypurGel infused memory foam, engineered to maintain an optimal sleep temperature. Zoned Micro-Coils are reinforced to support you where you need it most.
  • Xtended Life Collection: These luxuriously thick mattresses offer the best of foam and zoned coil systems that promise durable comfort and support year after year. Each model features King Koil's 1022 Perfect Contour Reaction Coil System, which includes 1000 Active and Reaction coils that work together to improve postural alignment.
  • iBed Collection: The iBed models combine enhanced cooling technology with relieving pocketed coils for optimal support. These models arrive conveniently packaged to your door and are available in firm, medium, or plush. Each model features King Koil's perforated HypurAir Gel technology to promote airflow, and open cell Graphite-infused memory foam that draws heat away from your body.
  • Luxury Collection: This ultra indulgent collection features specialty foams and advanced coil technologies for all-night support and next-level comfort. With a wide variety of firmnesses and pillow top options, there's something for everyone in the Luxury Collection. Each model features 588-858 Contour Elite Coil System, designed to reduce motion disturbance and relieve pressure points. AdvantaGel offers a cooler sleep while providing luxurous comfort and durability.
  • iMattress Collection: This collection combines advanced latex and foam technologies offering cooling comfort and pressure relief. Each model features King Koil's GelResponse Latex – an eco-friendly combination of pressure relieving, breathable latex with gel beads for an optimal sleep temperature. The Perfect Foam Core ensures durable, long-lasting support.
  • Intimate LS Collection: Inspired by European luxury, each time-resistant layer rests upon 1000 hand assembled cotton calico wrapped steel coils and finished with button tufting. Each model features temperature regulating foams infused with carbon fibres and graphite latex to provide superior breathability and durability. Layers of responsibly sourced horse hair, joma wool and cashmere create layers of comfort for optimal sleeping conditions. The Intimate LS is King Koil's most luxurious mattress collection.

Motion Isolation

Motion Isolation depends greatly on the model you select, with King Koil's firmer and all foam models providing the best motion isolation. Almost every King Koil coil system is additionally designed to reduce motion disturbance, enhancing isolation across the board. The SmartLife models are a great choice for technologically driven motion isolation and targeted support.

Edge Support

Due to King Koil's advanced zoned coil systems, most King Koil mattresses provide excellent edge support, as outer coils are reinforced to reduce sagging or any roll-off, while keeping you supported while you sleep. The zoned coil systems are ideal for couples who need different kinds of support.

Bed Frame Compatibility

King Koil recommends that you pair your mattress with a box spring for optimal mattress performance. King Koil's FAQ section hints that King Koil may not fulfill your mattress warranty if it isn't properly paired with a box spring, so ensure that you use a box spring in order to comply with the terms of the warranty.


King Koil's warranties depend entirely on the mattress you purchase. Unfortunately, this information isn't granted until you purchase a mattress, but King Koil does guarantee against any manufacturing defects. You must register your mattress online to make future warranty claims. King Koil mattresses are generally purchased through third party retailers, and King Koil has no online store, meaning that shipping and return policies are entirely unique to these retailers.

Why Buy King Koil?

  • You need temperature regulation. While King Coil mattresses vary widely in construction, almost every King Koil mattress features their patented HypurGel layer, or their Graphite infused memory foam. Both of these specialized cooling technologies are designed specifically to regulate your temperature for a comfortable sleep.
  • You sleep with a partner. Due to King Koil's wide variety of mattress types, firmnesses, and constructions, couples with different sleep styles are bound to find a model that fits both of their sleep needs and preferences.
  • You need back support. Many of King Koil's mattress collections featured zoned coil systems, which aren't just great for motion isolation– they're also great for providing specialized support to your lumbar region while providing extra pressure relief to hip and shoulder regions. The wide range of zoned coil systems allow you to choose which model best suits your needs.

Why Avoid King Koil?

  • You're overwhelmed by too many options. While many people appreciate King Koil's wide range of collections and models, you may find their options too overwhelming, resulting in indecision and added stress. For a more simplified buying process, check out Saatva's 4 available models.
  • You don't want to buy from a third-party retailer. Many mattress companies allow you to purchase a model online, directly from their site, without all the hassle of a third party retailer. King Koil doesn't have an online store, so the only way to purchase one of their mattresses is through visiting one of these retailers in-store, or buying from their website online. If this buying process seems too inconvenient, King Koil may not be the right choice for you.

Final Takeaway

King Koil is a great choice if you want a wide variety of mattress models at many different price points. Their mattresses are also surprisingly comfortable. You can get King Koil mattresses at a great price, today!

While this is a fantastic mattress at this price point, our #1 pick for 2023 is SAATVA mattress. Saatva is a luxury mattress shipped to your door (unlike other bed in a box brands dropped off on your doorstep) w/ FREE white-glove delivery & setup. They have over 50,000 5-star reviews, and they're incredibly comfortable (for all sleep positions).

Check Price →

Check Price →
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