Best Memory Foam Mattress Under $400 in 2026: Affordable Comfort & Support

A good memory foam mattress provides pressure relief, motion isolation, and body-contouring comfort—all at an affordable price. If you’re looking for a high-quality memory foam mattress under $400, there are plenty of great options that offer cooling technology, durable construction, and multiple firmness levels. Whether you’re a side sleeper, back sleeper, or need a mattress for a guest room, this guide will help you find the best memory foam mattress under $400 for your needs.

Key Highlights

• Affordable, high-quality memory foam mattresses under $400
• Pressure-relieving and motion-isolating designs
• Cooling features to prevent overheating at night
• Available in Twin, Full, Queen, and some King sizes

Discover The Best Memory Foam Mattresses Under $400

Types of Memory Foam Mattresses Under $400

Memory foam mattresses come in different designs and layers, affecting comfort and support. Here are the common types in this price range:

Type	Pros	Cons
Traditional Memory Foam	Contours to the body, great pressure relief	Can retain heat without cooling features
Gel-Infused Memory Foam	Cooling gel prevents overheating	May be slightly firmer than standard foam
Open-Cell Memory Foam	Increased airflow, breathable, lightweight	May be less durable over time
Hybrid Memory Foam	Combines memory foam with coils for added support	Can be heavier and more expensive

Smart Tips For Choosing The Best Memory Foam Mattress Under $400

Firmness Level

Your sleep position determines the best firmness for your comfort.

• Soft (Plush) – Ideal for side sleepers, as it cushions pressure points.
• Medium – Best for combination sleepers who change positions at night.
• Firm – Great for back and stomach sleepers, providing extra support.

Cooling Features

Memory foam tends to trap heat, so look for:

• Gel-infused foam for heat dissipation.
• Breathable covers to wick away moisture.
• Ventilated or open-cell foam for improved airflow.

Thickness and Layers

Most memory foam mattresses under $400 range from 8 to 12 inches thick. Thicker models offer more comfort and durability, especially for heavier sleepers.

Motion Isolation

If you sleep with a partner, motion isolation prevents disturbances. Memory foam naturally absorbs movement, making it great for couples.

Edge Support

Memory foam mattresses can sometimes lack edge support, which is important if you sit or sleep near the side. Some models reinforce the edges for better durability.

Tips for Using a Memory Foam Mattress Under $400

• Let it fully expand – Memory foam mattresses come compressed in a box and need 24-72 hours to reach their full shape.
• Use a solid foundation – A sturdy platform bed or slatted frame helps prevent sagging.
• Rotate regularly – Rotating your mattress every 3-6 months prevents uneven wear.
• Protect it with a cover – A waterproof mattress protector keeps it clean and extends its lifespan.

Popular Questions About Memory Foam Mattresses Under $400

Is $400 enough for a high-quality memory foam mattress?

Yes! Many memory foam mattresses under $400 offer excellent comfort, pressure relief, and durability.

What’s the best memory foam mattress thickness under $400?

A 10- to 12-inch mattress is ideal for most sleepers, providing a balance of support and comfort.

Can I get a Queen-size memory foam mattress for under $400?

Yes! Many brands offer Queen-size memory foam mattresses in this price range.

How long will a memory foam mattress under $400 last?

With proper care, a good memory foam mattress can last 6-8 years, depending on quality and usage.

Finding the best memory foam mattress under $400 is easy when you know what to look for. Whether you want plush comfort, firm support, or cooling features, there are affordable and high-quality options to improve your sleep without overspending.