# Best Keyboard Case Foam (2026) Source: https://mechkeeblab.com/best/case-foam Updated: 2026-10-06 Publisher: MechKeeb Lab. Our score is an editorial rating out of 10 (fit 35%, features 25%, build 20%, value 20%), not a customer rating. Method: https://mechkeeblab.com/how-we-research#our-score Case foam sits in the empty space at the bottom of your keyboard, filling the cavity that otherwise lets each keystroke echo into a hollow, pingy sound. By absorbing that reverberation, foam gives a build a fuller, more controlled character that many people find far more pleasant. The two things to check are material and thickness: denser foams absorb more, while the right thickness matters because a piece that is too thick can press against the PCB and interfere with how the board seats together. Look for foam cut or trimmable to your specific case size. Case foam suits builders chasing a particular sound signature and anyone bothered by the empty, resonant tone of a stock board. It is one of the cheapest and easiest mods, requiring no disassembly of switches and no permanent changes. That said, tastes differ, and some people actually prefer a more open sound, so treat foam as a tuning tool rather than a mandatory step. If your board sounds hollow and you want it warmer, this is a low-risk place to start. ## Picks ### 1. YIMAGUJRX RUNJRX Keyboard Poron Switch Pads, LE-32 Poron Sound Dampening Foam,Eva Keyboard PCB Modular Foam for Mechanical Gaming Keyboard Our score: 8.4/10 (Fit for the job 9/10 · Features and specs 8/10 · Build and materials 8/10 · Value 8/10) YIMAGUJRX RUNJRX sound kit with a full-layout LE-32 Poron bottom sheet, 120 Poron switch pads and 120 EVA modular pieces that fill the gap between the PCB and the plate. Pros: - Three mods in one pack: bottom case foam, switch pads and modular PCB-to-plate foam - Modular EVA pieces fit any keyboard layout with no cutting, according to the listing - Switch pads have a film layer and adhesive backing, and a plastic pry bar is included Cons: - The Poron bottom sheet is not pre-cut and must be trimmed with scissors to fit the case - 120 pads cover a 104 or 108 key board only once, with a small margin for mistakes Details: https://mechkeeblab.com/product/B0BW5L8YG3 ### 2. HONKID Keyboard Foam Sound Dampening Bottom, LE-20 Poron (3mm) Our score: 8.1/10 (Fit for the job 9/10 · Features and specs 7/10 · Build and materials 8/10 · Value 8/10) HONKID's 3mm LE-20 Poron bottom foam is a middle thickness option for balanced case dampening. Pros: - 3mm thickness balances dampening with fit in most typical cases - LE-20 Poron absorbs case echo and reduces hollow ping - Easy first sound mod that needs no soldering or special tools Cons: - Foam must be trimmed to your case, which takes careful cutting - Check the foam sheet dimensions fit your case before ordering Details: https://mechkeeblab.com/product/B0B4JXKNDQ ### 3. RunJRX YIMAGUJRX Keyboard EVA Foam Case Foam Bottom Dampening 61/64/87/100/104/108 Our score: 7.8/10 (Fit for the job 8/10 · Features and specs 8/10 · Build and materials 7/10 · Value 8/10) RunJRX YIMAGUJRX's EVA case foam fits 61, 64, 87, 100, 104 and 108 key keyboards for bottom dampening. Pros: - Multiple size options cover compact through full size boards - EVA bottom foam reduces hollow echo inside the case - Budget friendly first step in sound tuning Cons: - EVA dampens less than Poron at similar thickness - Precut sizes may still need trimming around screws and standoffs Details: https://mechkeeblab.com/product/B09WZWP9KR ### 4. HONKID Keyboard Foam Sound Dampening Bottom, LE-20 Poron (2mm) Our score: 7.8/10 (Fit for the job 8/10 · Features and specs 7/10 · Build and materials 8/10 · Value 8/10) HONKID's 2mm LE-20 Poron bottom foam reduces hollow case sound on mechanical keyboards. Pros: - 2mm thickness fits cases with limited internal space - LE-20 Poron is a quality dampening material - Bottom foam reduces echo and hollow ping Cons: - Thinner foam gives less dampening than thicker options - Must be cut or matched to your case size Details: https://mechkeeblab.com/product/B0B151N6V4 ### 5. YIMAGUJRX Keyboard Sound Dampening Foam,Keyboard Foam for Mechanical Keyboard Bottom,Made of LE-32 Poron (3mm Thick) Our score: 7.8/10 (Fit for the job 8/10 · Features and specs 7/10 · Build and materials 8/10 · Value 8/10) A full-layout sheet of LE-32 Poron, 3mm thick, from YIMAGUJRX. It is cut to size with scissors and laid in the bottom of the case to reduce vibration and hollow sound. Pros: - LE-32 Poron with a fine, uniform cell structure that the listing says resists compression over time - One sheet of about 42.8 x 12.4cm covers 61 to 108 key layouts once trimmed to the board - Includes a plastic pry bar for opening the keyboard case, so no extra tool is needed for that step Cons: - Not pre-cut for any layout: you trim it with scissors to match your case and standoffs - Only one 3mm thickness in this listing, which may be too thick or too thin for some cases Details: https://mechkeeblab.com/product/B0BLTQ5WRR ### 6. Mintcaps 2-Piece Keyboard Sound Dampening Foam - 68 Layout Silencer/Gasket EVA Our score: 7.6/10 (Fit for the job 8/10 · Features and specs 7/10 · Build and materials 7/10 · Value 8/10) Mintcaps' 2-piece EVA sound dampening foam kit fits 68 layout keyboards as a silencer and gasket set. Pros: - 2-piece kit handles both case and plate dampening layers - Made for 68 layout boards, a very common compact size - EVA material is soft and easy to install Cons: - Only fits 68 layout keyboards, so other sizes need a different kit - EVA is less premium than Poron for sound absorption Details: https://mechkeeblab.com/product/B0B131R8G1 ### 7. YIMAGUJRX Sound Dampening Foam for Keyboard Bottom, EV-250 (3mm Thick) Our score: 7.6/10 (Fit for the job 8/10 · Features and specs 7/10 · Build and materials 7/10 · Value 8/10) YIMAGUJRX's EV-250 bottom foam is 3mm thick for reducing case hollowness on mechanical keyboards. Pros: - 3mm thickness fits most cases while filling empty space - EV-250 foam is designed for sound absorption - Simple cut-to-fit mod for many keyboard sizes Cons: - Foam sheet may need trimming to fit your keyboard's case - Material is less well known than Poron among enthusiasts Details: https://mechkeeblab.com/product/B0BLVM5X5P As an Amazon Associate I earn from qualifying purchases.