The 5 Best Firm Mattresses: 

  • Best Firm Memory Foam Mattress – Nectar
  • Most Affordable Hybrid Mattress – Linenspa Memory Foam Hybrid
  • Most Comfortable Firm Mattress – Casper Element
  • Best Medium Firm Mattress – Sealy Memory Foam Bed-in-a-Box
  • Best Firm Hybrid Mattress – SweetNight Island


Why Nectar wins as best firm memory foam mattress

If you ask a memory foam lover, there’s nothing like the conforming, contouring feel of a good memory foam mattress. Our top pick for the best firm memory foam mattress is Nectar, and we think it provides that signature feel you’re expecting at a super affordable price. The mattress is also more supportive than your average foam bed, especially for side sleepers. 

Nectar’s best features

  • We rate the Nectar mattress to be around a medium-firm. It offers an ample amount of spinal support for back and stomach sleepers who need it for neutral alignment in their back. 
  • Wrapping the three layers of foam is a removable, quilted polyethylene cover. The cover’s cooling technology will quickly wick away superficial heat, and the cover is machine-washable. You won’t sleep cold, but it won’t warm up either, so it’s what we call temperature-neutral.
  • One of the best parts about the Nectar mattress is that it is highly affordable.

Why we picked this bed

Nectar is an all-foam mattress about 12” thick, making it heftier than your typical bed-in-a-box mattress. Once you lay down, you sit on top of the mattress for about 4-5 seconds until you slowly feel the bed’s layers hug the curves of your body. We would compare it to the feel of a TempurPedic mattress, but it’s hundreds or even thousands of dollars cheaper than some TempurPedic models.

Linenspa Memory Foam Hybrid

linenspa memory foam innerspring mattress review back sleepers and stomach sleepers

Why Linenspa Memory Foam Hybrid wins as most affordable firm hybrid mattress

With its hybrid construction of springs and foam, the 8” Linenspa Memory Foam Hybrid is a solid contender if you’re looking for a firm mattress that won’t break the bank. The bed is supported by a 6” layer of steel springs, which are covered by layers of comfort foam and memory foam. 

Linenspa Memory Foam Hybrid’s best features

  • Unbeatable value for your money, especially if you’re using the bed in a guest room or vacation home
  • Hybrid construction allows more airflow than all-foam beds, so it’s easier to stay cool at night
  • Works for most sleeping positions, including back, stomach, and combination

Why we picked this bed

Overall, it’s a no-frills, cost-effective firm mattress that’s cheap and ideal for kids, guests, or rental properties. Plus, since it’s a hybrid bed, it’s more capable of handling heavier individuals (over 225 lbs) than an all-foam bed would be.

Casper Element

casper element mattress review stomach sleeper

Why Casper Element wins as most comfortable firm mattress

Although the Casper Element isn’t the firmest bed on this list, we think it provides an all-around comfortable sleeping experience. It’s designed with soft, neutral-foam but still has a medium-firm profile, striking an excellent balance between comfort and support. Plus, it’s made by Casper, which has earned a stellar reputation in the online mattress industry.

Casper Element’s best features

  • Caters to all sleeping styles, including back, stomach, side, and combo
  • Great for couples thanks to its strong edge support and motion isolation
  • CertiPUR-US certified means that it’s free from toxins and harmful chemicals

Why we picked this bed

In short, the Casper Element is a comfortable all-foam bed that delivers great value for the money. It’s responsive yet firm, making it a solid option for any sleeping position and many body types.

Sealy Memory Foam Bed-in-a-Box

cocoon chill cover cool

Why Sealy Memory Foam Bed-in-a-Box wins as the best medium-firm mattress

Sealy is one of America’s most enduring mattress brands, which is why it’s exciting that they’ve entered the bed-in-a-box game. This mattress features a classic memory foam feeling and is sold in multiple height profiles, so you can choose the best one for you. It’s also incredibly affordable and can be delivered directly to your doorstep.

Sealy Memory Foam Bed-in-a-Box’s best features

  • Available in three height profiles (8”, 10”, and 12”)
  • Memory foam layer cradles and molds to your shape
  • Infused with Sealy’s CopperChill technology that’s designed for cooling

Why we picked this bed

If you want the convenience of a bed-in-a-box but prefer buying from a well-established brand like Sealy, this bed is an excellent option. It’s ideal if you want a bed that cushions your body and offers that quintessential memory foam experience.

SweetNight Island

Why SweetNight Island wins as best firm hybrid mattress

SweetNight produces a range of comfortable and cost-effective mattresses, with the Island being one of the company’s firmer options. It’s built with a support layer of individually wrapped pocketed coils and topped with three layers of foam for comfort and additional support. Like most neutral-foam beds, the SweetNight Island is comfortable and suited for the average sleeper.

SweetNight Island’s best features

  • Works for all body types, including petite, average, and heavier folks
  • Two thickness options to choose from (10” and 12”)
  • Ample motion isolation and edge support make it a great option for couples

Why we picked this bed

Simply put, this mattress checks a lot of boxes. Not only is it designed for all body and sleeper types, but it’s also affordable and pleasant to sleep on. We think that most people will enjoy it, but we particularly recommend it if you’re in a heavier weight category since the coils will provide extra support and airflow.

How We Test Mattresses

The Slumber Yard team personally tests and assesses each sleep product we review through a series of practical, hands-on inspections and assessments, with utmost commitment to honesty and authenticity. We have personally hand-tested over 175 mattresses. Our reviews, comparisons, and buyer guides go beyond product descriptions so you can get a real-person perspective of each bed’s feel, look, and value. From our sleep science certified editors and writers to our production and business teams, everyone’s committed to helping you find the mattress of your dreams and (hopefully) the best sleep of your life.