We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-10-06 · 6 min read · Independent comparison
If you want a direct-fit refresh for Sony WH-CH720N headphones used for work, choose Krone Kalpasmos Replacement Earpads; if you need replacement cushions for Bose QuietComfort Ultra headphones, choose Miruchertter Ear Pads. These two sets are built for different headphones entirely, so the real decision comes down to which model you own — and, for work setups, which fit, material and longevity matter most to you.
• Krone Kalpasmos Replacement Earpads — biggest strength: purpose-built for the Sony WH-CH720N family, with extra-thick slow-rebound memory foam designed to reinforce noise isolation and bass, plus a 3-year manufacturer warranty.
• Krone Kalpasmos Replacement Earpads — biggest trade-off: only fits the Sony WH-CH720/WH-CH720N line, so it is useless if you own anything else, and the brand notes that installation still rewards a little patience.
• Miruchertter Ear Pads — biggest strength: snap-on replacement cushions for the Bose QuietComfort Ultra, using memory foam and softer protein leather for long listening sessions.
• Miruchertter Ear Pads — biggest trade-off: strictly limited to the Bose QC Ultra, with a shorter 1-year warranty description than the Sony option.
• Who each is for: Krone Kalpasmos for Sony WH-CH720N owners (a common pick for wireless headphones for work); Miruchertter for Bose QuietComfort Ultra owners who want to restore comfort and isolation.
The Krone Kalpasmos set is a single-purpose product: it exists to replace worn ear pads on the Sony WH-CH720, WH-CH720N and WHCH720N. If that is your headphone, this is the most straightforward match on this page. The cushions combine protein leather with high-density, slow-rebound memory foam, and the brand deliberately adds extra thickness compared with the stock pads. That extra thickness is the whole design story here — it is meant to tighten the seal around your ears, which in turn supports the headphone's noise-cancelling behaviour and gives bass a little more body. For anyone wearing Sony headphones through a long workday, a better seal is often the difference between "fine" and "genuinely comfortable."
Buy it if you own a Sony WH-CH720N and the originals have gone flat, cracked or started flaking. The materials — protein leather over memory foam — are chosen for softness, sweat resistance and durability, and the brand uses hand stitching plus heavy-duty glue inside the seam to resist splitting. Krone Kalpasmos also recommends replacing ear pads roughly every 7–8 months for hygiene, and states these can last 180 days or more, which lines up with that advice. Installation is tool-free: pull the old pads, seat the new cushions, snap the covers on. The brand is honest that a bit of patience helps the fit come out clean. The 3-year manufacturer warranty is the standout supporting detail.
Skip it if your headphones are not in the Sony WH-CH720 family — this will not fit Bose, and it will not fit other Sony lines. Also skip it if you want a colour other than white; that is the only option listed. And if you are chasing maximum bass above all else, understand that these are still replacement cushions, not a re-voiced headphone — the improvement comes from thickness and seal, not from new drivers.
Miruchertter's ear pads are the opposite half of the same idea, aimed at a different headphone: the Bose QuietComfort Ultra. The brand states the compatibility restriction in unusually blunt terms — these fit the QC Ultra and nothing else — which is worth taking seriously, because Bose's pad mounts differ across generations. If you are unsure which Bose model you have, check before buying.
The design pairs memory foam with softer protein leather, and the pitch is comfort plus isolation. Dense foam presses against the head to block outside noise, which matters on a noise-cancelling headphone: the electronics can only cancel so much, and a worn, leaky cushion undermines all of it. If your QC Ultra pads have compressed or the coating has started peeling, new foam restores the seal the headphone was tuned around. Miruchertter also highlights stitching quality and material durability as the reason the pads hold up over time, and the snap-on design means replacement is a minutes-long job rather than a project. The listed warranty description is 1 (year) — shorter coverage than the Sony alternative, so factor that into how you weigh the two.
Buy it if you own Bose QuietComfort Ultra headphones and want the comfort and isolation back without sending anything away for service. The black finish is the practical default for a headphone that gets used daily. Skip it if you own any other Bose model, or a Sony, or anything else — the fit simply will not work. Skip it too if you want the longest warranty on this page, because that is not what this set offers.
• Own a Sony WH-CH720N → Krone Kalpasmos Replacement Earpads. The compatibility list is explicit and the fit is designed around that chassis.
• Own a Bose QuietComfort Ultra → Miruchertter Ear Pads. Nothing else here will mount on a QC Ultra.
• Want the most robust noise isolation from thicker foam → Krone Kalpasmos Replacement Earpads. Extra thickness over stock is the stated design goal.
• Want a softer, "like-new" comfort refresh for long sessions → Miruchertter Ear Pads. Softer protein leather is the headline material claim.
• Want the longest stated coverage → Krone Kalpasmos Replacement Earpads. A 3-year manufacturer warranty description versus 1 year.
• Want the simplest install → Miruchertter Ear Pads. Snap-on, described as a minutes-long job.
• Care most about seam durability → Krone Kalpasmos Replacement Earpads. Hand stitching and heavy-duty internal glue are called out specifically.
• Want a black pad rather than white → Miruchertter Ear Pads. Colour options are limited to one per product in the data.
In my opinion, the deciding factor is your headphone, not the pad. I would buy the Krone Kalpasmos Replacement Earpads if I owned a Sony WH-CH720N and used it for work — the extra-thick memory foam, sweat-resistant protein leather, hand-finished seams and the 3-year warranty description make it the more thoroughly specified replacement of the two. I would buy the Miruchertter Ear Pads only if I owned a Bose QuietComfort Ultra, where it is the correct and only fit, and the snap-on convenience genuinely appeals. Neither is a universal upgrade; each is the right answer for exactly one headphone. Check the current price on Amazon before you commit, since these are consumable parts you may end up buying more than once.
No. Krone Kalpasmos lists compatibility with the Sony WH-CH720, WH-CH720N and WHCH720N only. Bose headphones use a different mounting design, so these will not fit.
No. Miruchertter states the pads are only compatible with Bose QC Ultra headphones and asks buyers to confirm their model first. For Sony, you need the Krone Kalpasmos set instead.
Based on the data sheets, Krone Kalpasmos backs its pads with a 3-year manufacturer warranty and describes hand stitching plus heavy-duty glue to prevent splitting, while Miruchertter lists a 1-year warranty description with durability claimed through stitching and materials. On stated coverage alone, the Sony-compatible set looks the more durable bet — but both are wear items, and how long they last depends on daily use.
Both are tool-free. Krone Kalpasmos says to remove the old pads, place the new cushions and snap the covers on, noting that a little patience helps. Miruchertter uses a snap-on design the brand describes as quick and hassle-free. Either way, allow a few minutes and work carefully around the seams.
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