65% Foam Kit: Benefits and Drawbacks Explained

If you’re building or upgrading a 65% keyboard, you’ve likely come across the term 'foam kit.' These kits promise quieter acoustics, a more solid feel, and reduced hollowness. But are they always a good idea? In this review, we break down the benefits and drawbacks of 65% foam kits to help you decide if one belongs in your build.

We’ll explore how foam interacts with your plate, PCB, and case, and we’ll also touch on how it compares to other sound-dampening solutions. By the end, you’ll know exactly what a foam kit can and can’t do for your typing experience.

What Is a 65% Foam Kit?

A 65% foam kit typically includes precision-cut foam layers designed to fit inside your keyboard case. These layers sit between the PCB and the case bottom, and sometimes between the plate and PCB. The foam absorbs vibrations and dampens the hollow resonance that often occurs in aluminum or plastic cases.

Most kits are made from materials like EVA, silicone, or polyethylene foam. They come in varying thicknesses, and some are designed to work with specific boards like the Sonnet or Eighty (2020). Choosing the right foam for your board is crucial, as a poor fit can cause misalignment or interfere with mounting.

• Foam kits are usually case-specific or universal with adjustable layers.
• They can be used with or without other mods like tape or gaskets.

Key Benefits of a 65% Foam Kit

The primary benefit of a foam kit is sound improvement. By filling the empty space inside the case, foam reduces the 'ping' and echo that many keyboards produce. This is especially noticeable with aluminum cases, which are prone to high-pitched resonances. With foam, the sound becomes deeper and more muted, giving a thockier profile that many enthusiasts prefer.

Another advantage is the change in typing feel. Foam adds a slight cushioning effect, which can make the bottom-out feel softer and less harsh. This is particularly beneficial if you’re using stiff switches or a metal plate. Additionally, foam can help reduce vibrations transmitted through the case, which some users find more comfortable for long typing sessions.

Finally, foam kits are relatively inexpensive and easy to install. They don’t require soldering or permanent modifications, so you can experiment with different setups. For example, pairing a foam kit with the Sonnet Mounting Blocks can dramatically alter the board’s acoustics without much effort.

• Reduces hollow sound and resonance.
• Softens bottom-out feel.
• Easy reversible mod.

Potential Drawbacks to Consider

While foam kits offer several benefits, they aren’t without downsides. One significant drawback is that foam can mute the natural sound of your switches and plate. If you enjoy a bright, clacky sound profile, foam might make your keyboard sound dull or muffled. It can also reduce the tactile feedback you feel, as the cushioning absorbs some of the impact.

Another issue is compatibility. Not all foam kits are universal. A kit designed for a specific board like the Eighty (2020) may not fit other 65% cases. Even universal kits might require trimming, which can be fiddly and time-consuming. Moreover, adding too much foam can cause the PCB to sit higher, potentially interfering with keycap travel or causing the case to not close properly.

Finally, foam can trap heat, which is rarely a problem for keyboards but can be a concern if your board has RGB lighting or a hot-swap socket that runs warm. While this is not a major issue, it’s something to keep in mind.

• May mute preferred sound profiles.
• Fit issues with non-standard cases.
• Can interfere with key travel if too thick.

Foam Kit vs. Other Sound Dampening Methods

Foam kits are not the only way to tame keyboard acoustics. Alternatives include using shelf liner, tape mods, or even adding weights to the case. Each method has its own pros and cons. For instance, tape mods are cheaper and more flexible, but they don’t fill the case as effectively as foam.

Foam kits are generally more effective at reducing hollowness because they occupy the empty space. They also provide a more uniform dampening effect compared to tape, which only affects the area it covers. However, tape mods are less intrusive and can be easily removed. If you’re looking for a comprehensive solution, a foam kit is often the best choice.

When considering a foam kit, think about the materials you’re using. For example, the Envoy Universal Aluminum Plate – Red Edition is a stiff plate that can benefit from foam to reduce ping. Similarly, pairing a foam kit with the Anthracite Silent Tactile Switches can create an exceptionally quiet and smooth typing experience.

• Foam kits provide fuller dampening than tape mods.
• Consider your plate material when choosing foam thickness.

How to Choose the Right 65% Foam Kit

When selecting a foam kit, consider the material and thickness. Thicker foam generally provides more dampening but can alter the feel significantly. If you’re unsure, start with a thinner foam and adjust. Also, check if the kit is designed for your specific case or if it’s a universal fit that you can trim.

Think about the sound you want. If you prefer a deep thock, a dense foam like EVA or silicone is ideal. If you want to retain some clack, a thinner polyethylene foam might be better. Additionally, consider the ease of installation: some kits come with adhesive backing, while others require you to place them carefully.

Finally, read reviews and watch sound tests to get an idea of how a particular foam kit performs with different plates and switches. For instance, the Sonnet PCB is a popular choice for 65% builds, and many users report that adding a foam kit enhances its already balanced sound.

• Start with a thinner foam if you're new to modding.
• Check if the kit includes adhesive or requires manual placement.

A 65% foam kit can be a great addition to your keyboard if you want a quieter, more solid typing experience. It offers clear benefits in sound dampening and feel, but it’s not for everyone. Consider your preferences and the specific characteristics of your board before making a decision. If you're ready to experiment, explore our selection of foam kits and accessories to find the perfect match for your build.