(Top 4):
Best Trundle Bed Mattress Options Online in 2021

Where to buy a 6 inch mattress online

If you own a trundle bed or are looking to buy one you may have realized that you cannot purchase any old mattress for your trundle bed. The thickness needs to be thin enough that it can fit underneath the top bed. Generally the mattress for a trundle bed should be between 6″-8″ thick. It is important to measure your specific trundle set up to be sure what works for you. In this post we have listed our favorite mattresses that are all between 6 inches and 8 inches thick, which is our recommended thickness for the vast majority of trundle beds on the market today. A mattress of this thickness gives enough room to easily slide the trundle in and out while also still offering enough comfort and support. 

AFFILIATE DISCLOSURE: Some of the links in this article are affiliate links. This means we may be compensated if you decide to purchase an item through one of our links.

How thick should a trundle bed mattress be?

The majority of trundle beds fit a twin or full mattress between 6″ and 8″ thick. We generally recommend a 6″ mattress, as this will make moving the trundle in and out easier and still will provide plenty of support. 6 inch thick mattresses are not as common in the market as other sizes so your options will be slightly limited. 

What is the best type of mattress for a trundle bed?

Since trundle bed mattress is thinner than most average mattresses, you want to make sure you purchase one that is of nice quality and that won’t begin to break down or sag. Many of the trundle beds mattresses on Amazon are made in China with poor quality foam and will not last or hold sleepers of any substantial weight. A higher quality mattress will have a high density base foam that can support any type of sleeper and will hold up for years to come. 

Things to consider before buying a mattress for your trundle bed.

Frequency of Usage: We have listed mattresses that meet all standards and budgets. Be sure to think about how often you will be using your mattress. If it will be a guest bed or an extra sleeper you may want to go with a budget mattress, while if it is an every night sleeper you may lean towards a more luxury sleeping experience. 

Material: When it comes to material memory foam, latex and innerspring mattresses all have different benefits and feels. It is important to know which you prefer and choose a mattress that meets your needs. 

Price: Generally speaking, the more expensive the mattress the higher quality materials and the longer it will last. Our best all around mattress is a great middle ground between quality materials and an affordable price. 

The different types of trundle mattresses available

Thinner mattresses that are used for trundle beds or bunk beds are very common in the marketplace . There are a variety of options and different materials to choose from, each with its own benefits and downsides. 

Memory Foam: Memory foam was originally invented and used by NASA and ultimately transitioned into use within the sleep industry. Memory foam has great pressure relief abilities but can have a unique feel that takes some getting used to. If you have never slept on a memory foam mattress we recommend testing one out before deciding to purchase one. 

Latex: Latex is one of the most natural and eco-friendly materials in the bedding industry. Latex is not only a popular health-conscious choice but it also has amazing pressure relief and support capabilities. The only downside to latex is that it is quite a bit more expensive than competing foams. 

Innerspring: An innerspring mattress is going to give the most support and “bounce” out of all the mattress types. Innerspring mattresses are also commonly referred to as “hybrid” mattresses. If you have back pain or are looking for additional support, then we generally recommend an innerspring option. Innerspring mattresses will also usually hold up longer than their all foam competitors. 

Top 5: 6 Inch Mattresses



The best all around memory foam mattress for the price.
Over 2,000 5-star reviews.

From $149


The Wanderlust mattress is a basic memory foam mattress made by RvMattress.com, which is owned by Brooklyn Bedding. Brooklyn Bedding is a trusted name in the mattress industry and makes all of their own mattresses locally  in the USA. the majority of other 6″ mattresses you will find on Amazon will be imported from China and much lower quality. The Wanderlust is available in a variety of thicknesses from 6 inches to 14 inches thick. The Wanderlust is a standard memory foam mattress, made with a layer of high density support foam on the bottom and memory foam on top. This mattress has unbeatable value at its low price point. 

High quality natural latex with an organic cotton cover. Greenguard gold certified. Available in a variety of thicknesses and firmnesses.

From $749


PlusBeds specializes in eco-friendly and chemical free mattresses. Their Natural Bliss mattress combines natural latex and an organic cotton cover to give customers a healthy and hypoallergenic sleeping surface that they can feel good about. PlushBeds has been in the mattress industry for many years and is one of the most trusted “eco-friendly” sleep brands on the market. Their prices are also very reasonable compared to their competitors. If you are looking for a natural option for your trundle bed then this is by far the best mattress for you. 



Comfortable 2-sided mattress for all sleep preferences. Organic cotton cover.
Great reviews (over 200 5-star reviews).

From $299


The luxury gel foam mattress by Mattress Insider gives a  luxury memory foam feel at a great price. The mattress also allows for you to unzip and rearrange the foam layers in order to make the mattress firmer or softer. Mattress Insider has coupled this mattress with a high end organic cotton cover that you can feel comfortable resting your head on. Mattress Insider has been in the mattress industry since 2008 and is a brand you can trust. If you enjoy the feel of memory foam and want a product that will last then this is a great option for you. 


A luxury foam mattress at an affordable price

From $459


The Park Meadow mattress by Mattress Insider is the only mattress on this list that utilizes an innerspring (aka pocketed coil) support system. This mattress is great for heavier sleepers or for those who prefer the feel of a traditional innerspring mattress over that of memory foam or an all foam option. Traditionally innerspring mattresses tend to last longer than all foam mattresses as well. Mattress Insider has been making mattresses since 2008 and is a trusted name in the industry. If you are looking for an innerspring mattress that has support but is still thin enough to slide under a trundle bed then this mattress is a great option. 



A mattress built for kids that includes a waterproof cover and a pillow

From $399


5 Little Monkeys is one of the only companies on the market that manufactures a mattress specifically for kids. Their mattress is 8″ thick and made of temperature regulating memory foam. It also comes with an organic cotton removable/washable cover and a pillow. The 8 inch thickness of this mattress will easily slide under a trundle bed and the memory foam and organic cotton will be plenty of support and comfort for your kids. 

Need accessories for your trundle bed mattress?

If you need sheets, comforters, mattress protectors, etc… all of the companies listed above also provide accessories that you can purchase with your mattress. 

Alternative options for purchasing a trundle bed mattress?

If you prefer not to purchase your mattress online you can look for custom mattress factories in your area to build you a mattress you can test out before buying. A couple custom mattress manufacturers you can check out in person are:

What to do with your old mattress?

When you purchase a mattress online you are left to find a way to get rid of your old one. Luckily “A Bedder World” has mattress disposal services throughout the country. We work with mattress recycling centers to make sure your old mattress gets disposed of in the most eco-friendly manner possible. To date we have recycled over 500K mattresses. Book a pick up here. Or try recycling it yourself!


Trundle beds are very common in the market place and there are quite a few high quality companies providing options for replacement mattresses. All of the companies listed in this post are companies that we trust and that have great reputations within the sleep community. You can feel confident placing an order with an of them.