We compared 9 online mattresses to show you what each is best at

Type of mattress: A bouncy, breathable four-layer foam and latex bed that reportedly errs on the firmer end of the spectrum.

Cost: Twin ($520, originally $595), Twin XL ($570, originally $645), Full ($820, originally $895), Queen ($920, originally $995), King ($1,120, originally $1,195), CA King ($1,120, originally $1,195).

Special features: Latex and foam hybrid bed means that it won't overheat or lose bounce like other foam-based beds. Also made and engineered in the US.

Extra offerings: Get 10% off any order with a mattress now through March 11 with the code "SUPER" at checkout. Use code "INSIDER" any time at checkout to get up to $75 off select mattresses — the code is not valid on the Essential.

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Type of mattress: Soft, with good support. The mattress is built uniquely, with three different layers — 2 inches of hyperelastic polymer on the top, followed by a 3.5-inch layer of polyurethane foam, then a base of 4 inches of more polyurethane foam. The Purple mattress is technically medium-firm, but that really has more to do with its level of support than how it actually feels. The top layer really gives it a nice soft feel, while the rest of the mattress ensures a high level of support.

Cost: Twin ($649), Twin XL ($699), Full ($899), Queen ($999), King ($1,299), Cal King ($1,299).

Special features: The Purple Mattress is billed as the world's first No-Pressure Mattress, or, in other words, it supports the body without creating any painful pressure points or pockets of heat. The company's Smart Comfort Grid facilitates air flow and was built to eliminate pressure points altogether.

Extra offerings: Pick a premium Purple product for free with the purchase of a mattress.

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Type of mattress: A medium-soft foam mattress that's meant to be the best for every type of sleeper at a low cost. The Leesa was designed with every body shape and type of sleeper in mind. Instead of more customization, they've tried to remove the unnecessary fluff in mattresses and make one that works well for everyone.

Cost: Twin ($505, originally $595), Twin XL ($590, originally $695), Full ($760, originally $895), Queen ($845, originally $995), King ($1,015, originally $1,195), Cal King ($1,015, originally $1,195).

Special features: One mattress for every body type and sleeping position. Plus, for every 10 mattresses sold, Leesa donates one to those in need.

Extra offers: Take 15% off the Leesa and get free shipping.

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Type of mattress: Depends. After filling out a questionnaire with information such as your height, weight, firmness preference, and sleeping style, Helix will develop your very own sleep profile, which will be analyzed to optimize the performance of your mattress.

Cost: Twin ($600), Twin XL ($700), Full ($850), Queen ($995), King ($1,245), CA King ($1,245).

Special features: Customization of the mattress based on your individual sleep profile. They can even set you up with a split mattress so that you and your partner can both be perfectly comfortable sleeping side by side.

Extra offers: Enter your email address to unlock $125 off the Luxe Mattress in a Winter Flash Sale. Get $75 off select other mattress options.

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• I customized a Helix mattress to meet my particular sleep needs — and at a lower price than other high-end foam mattresses
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Type of mattress: A foam mattress designed to be suitable for all sleep types and the most affordable one in the direct-to-consumer market.

Cost: Twin ($350), Twin XL ($395), Full ($495), Queen ($595), King ($750), CA King ($750).

Special features: It's made out of foam that Tuft & Needle engineered in-house to do away with tired standard materials like memory foam and latex. The T&N foam is meant to adapt to every individual's body; the more pressure you apply, the more it supports you. According to Tuft & Needle, 500,000 people have tried the mattress and 95% have kept it.

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Type of mattress: A foam mattress that's meant to actually keep you cool while you sleep and support you so muscles recover better after exercise. If you've got an active lifestyle or you sleep hot but love the comfort of foam, Bear wants to be noticed by you.

Cost: Twin ($440, originally $540), Twin XL ($540, originally $640), Full ($640, originally $740), Queen ($740, originally $840), King ($840, originally $940), CA King ($840, originally $940).

Special features: Designed for optimal cooling and muscle recovery for athletes. Bear claims the premium graphite gel-memory foam used was engineered specifically for optimal cooling, comfort, and recovery, so if you want to lessen chances of a sore morning, this might be the best option. Plus, 1% of the proceeds go to Good Sports Charity.

Extra offers: Save $100 on orders over $500 with the code "SPRING100" and save $200 on orders over $1,200 with the code "SPRING200" at checkout. Both offers come with two free Cloud Pillows ($230 value).

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Type of mattress: A bouncy, breathable copper infused Talalay latex mattress to better disperse heat and foster a germ-free sleeping environment. Thanks to high-quality materials, it will work well for any sleeping position

Cost: Twin ($595, originally $745), Twin XL ($695, originally $845), Full ($775, originally $925), Queen ($845, originally $995), King ($995, originally $1,145), Cal King ($995, originally $1,145).

Special features: A copper-infused mattress means cooler sleep and one of the only options on the market that will kill gross germs on contact. You spend a lot of time in bed, so making sure that environment is germ-free is a nice benefit here. Copper is a natural antimicrobial mineral and also a well-known heat conductor, so you'll sleep cleaner and cooler with it present.

Extra offerings: Save $150 off your mattress and get two free pillows with the code "SAVE150" at checkout.

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Type of mattress: The smart bed is the best bed for techies. It's made from three layers of premium foams (responsive, transition, and high-density support) for a medium-firm feel. It has a smart technology cover designed to help you track and improve sleeping habits.

Cost: Full ($895, originally $995), Queen ($995, originally $1,095), King ($1,195, originally $1,295), Cal King ($1,195, originally $1,295).

Special features: Eight Sleep's Smart Bed is so-named because of its Smart Cover, which has proprietary sensors embedded in it. According to Eight Sleep, the technology leverages your sleep patterns and bio signals to help you get better sleep. You'll be able to track over 15 factors about your sleep and health, including REM sleep, deep sleep, heart rate, and respiratory rate. You can also selectively warm both or only one side of the bed. You can also connect your Smart Bed to your smart home. It can also detect when you're in light sleep and will trigger the alarm when it's easier for your body to wake up without being groggy.

Extra offerings: Save $100 on the Smart Bed automatically at checkout.

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Insider Picks produces detailed, thoroughly researched Buying Guides for virtually everything you'll need to buy online. We test dozens of products and then rank the best in one easy, straightforward list so you get the best without having to dump hours into the same internet research.

Below, you'll find a few of our guides to the best sleep products on the internet:

• The best sheets you can buy
• The best mattress toppers
• The best pillows
• The best duvet covers you can buy
• The best bed frames you can buy