High-quality foam mattresses are good for sleep due to their natural support and durable structure. A proper sleeping posture will help you feel refreshed and alert every morning. While all are foam mattresses, each brand applies technology and manufacturing methods differently. In this article, let's compare Japanese foam mattresses with Ru9 foam mattresses to see the pros and cons of these two popular types of foam mattresses on the market!
1. What is a foam mattress?
Foam mattresses are mattresses with a core made of foam. Foam is characterized by its flexibility and good elasticity.
Foam mattresses are characterized by good elasticity, softness, strong bonding, high durability, and are safe for users and the environment.
See more Detailed review of Foam mattresses
Currently, high-end foam mattress lines incorporate modern technologies (heat dissipation, cooling, etc.) to better serve everyone's sleep.

Today, foam mattresses have been significantly improved in both material and technology to become a high-end product line
Currently, there are the following types of foam mattresses on the market:
- PU foam: PU foam, also known as Polyurethane Foam. This type of foam is made from polyol and diisocyanate. Therefore, the elasticity of PU foam is highly rated, and it dissipates heat well, keeping the mattress surface dry, not causing heat or stickiness.
- Memory foam: Memory foam is made from PU foam and additives. Mattresses made from this material have a long lifespan, providing a gentle, buoyant feeling due to their impressive pressure-relieving capabilities. The body-hugging structure helps everyone achieve a complete deep sleep.
- PE foam: Polyethylene Foam is environmentally friendly due to its recyclability. Its weight is relatively light. What people like about PE foam mattresses is their softness, flexibility, and good elasticity. With an affordable price, this type of mattress has quickly won the hearts of consumers.
- PVC foam: This type of mattress is made from PVC plastic with the main components being foam, wood powder, and additives. PVC has the advantage of being very durable, resistant to force, soundproofing, and effective fire resistance.
2. How do Japanese foam mattresses and Ru9 foam mattresses differ?
Japan has many different foam mattress lines, among which the Oyasumi mattress line is prominent and typical. The comparison criteria in this article are taken from Ru9 foam mattresses and the representative of Japanese foam mattresses - Oyasumi mattresses.
Structure of Japanese foam mattresses and Ru9 foam mattresses
Ru9 foam mattresses usually have 2-3 layers, the bottom layer is firm PU foam, ensuring that the body does not sink too much, protecting the natural curve of the spine. The foam layers are tightly linked, capable of relieving pressure so that when lying down, there is no additional pressure. A cooling gel layer is added to support breathability, creating coolness. In addition, Contour Foam on the top layer is exclusive to Ru9, conforming to the body and protecting the user's sleep.

Ru9 foam mattresses are made up of many different foam layers
Japanese foam mattresses usually have a 1-3 layer PU foam structure. The top PU foam layer and the bottom layer have a profile cutting structure that enhances air circulation and prevents moisture. With uniform pressure distribution, users can lie comfortably without worrying about posture.
Mattress cover
Ru9 foam mattresses use a Tencel cover certified safe for humans and the environment. The fabric absorbs well, is soft, provides comfort, and does not cause itching.
Japanese foam mattresses, on the other hand, choose a Polyester cover, which is wrinkle-free, dust-resistant, and has a breathable 3D Spacer mesh layer.
Production technology
Both mattress lines feature modern, advanced production technology.
Ru9 foam mattresses use a thin-pressing and tight-rolling technology, making the mattress compact, easy to move, and store. Additionally, the exclusive Contour Foam layer enhances spinal support.
Japanese foam mattresses, however, focus on uniform pressure distribution technology to maintain body balance even in areas with greater weight-bearing such as the shoulders, hips, and calves. At the same time, the profile-cutting technology keeps the mattress surface dry, and users also receive a massage and relaxation, thereby improving blood circulation and boosting energy.
Price segment
Both mattress lines have a mid to high-end price segment.
Design

Subtle patterns and gentle colors that suit Japanese culture
Ru9 foam mattresses aim for a minimalist, luxurious design with blue and gray colors, without patterns. Japanese foam mattresses have patterns, suitable for those who prefer a gentler style.
Mattress size
Both types of mattresses mentioned above come in various sizes, suitable for different types of beds and users. Ru9 foam mattresses are available in 6 sizes: single, full, queen, king, square king, and super king.
3. Pros and cons of Japanese foam mattresses and Ru9 foam mattresses
Each type of mattress will have different pros and cons. However, since both are high-end mattresses, Japanese foam mattresses and Ru9 foam mattresses have few, negligible disadvantages that do not significantly affect the user experience.
Ru9 foam mattress
Advantages
- The mattress is compact, thin, and easy to fold for cleaning and moving. This allows you to always keep the mattress clean, extending its lifespan. After a period of use, the mattress will get dirty and needs to be cleaned for health safety. Therefore, you should choose a mattress that is not too heavy. You can also use mattress toppers to protect the surface from bacteria and liquids.
- Memory foam has an additional layer of cooling gel, making it breathable and cool. Despite being composed of many layers, Ru9 foam mattresses do not retain heat or cause stuffiness thanks to this gel layer.
- The elasticity and softness are just right to support the body, forming the most natural sleeping posture, which is good for joints and bones.
- The mattress has a long lifespan of over 10 years.
- When you buy a Ru9 foam mattress, you also get a 100-day trial, ensuring you choose the most suitable mattress.
- Safe materials, non-irritating to the skin, can be used even for small children.
- Plain, luxurious designs with cool color palettes.
Disadvantages
The heat dissipation time of the mattress is still long.
Japanese foam mattress

After a long time, your mattress will still retain its original shape
Advantages
- Firm PU Foam helps the mattress maintain its shape well, preventing significant sagging after use. Your mattress will always look new, retaining its original structure, and not causing discomfort or aches.
- Breathable, not stuffy even when lying for a long time. A breathable mattress is essential for good sleep.
- Even pressure distribution creates a gentle feeling when lying down. Weight will not be concentrated at one point, reducing pressure on joints and bones. You will no longer experience back pain when waking up.
- Long mattress lifespan (over 10 years).
Disadvantages
- The elasticity of the mattress is not very good.
- Heat circulation within the mattress is slow.
Above, the article has helped you compare Japanese foam mattresses and Ru9 foam mattresses. Both are made from foam material, but different layers, types of foam, and applied technologies have brought diverse experiences. Depending on individual needs and preferences, users can choose the mattress that suits them.
If you pursue a modern, minimalist, convenient, and lightweight style, you can use the Ru9 foam mattress with its two elegant colors and foldability. If you want to try a mattress with massage capabilities and the delicate patterns characteristic of the Land of the Rising Sun, you can choose a Japanese foam mattress.
A good mattress will help you get a good night's sleep, motivating you for a new workday. Furthermore, a mattress directly affects your body and sleeping posture, so to protect your bones and joints well, you should choose quality mattresses with a certain softness and durability, avoiding those that are too soft or too firm.
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