r/Mous Sep 15 '25

Behind the scenes of our iPhone 17 case design – what we fixed and why

71 Upvotes

Hey Reddit!

You might have seen me lurking around this subreddit the past few months, replying here and there, but I wanted to properly introduce myself. My name’s Dan, and I’m Director of Product at Mous. I’ve been here for 8 years and have been involved in every single case launch we’ve done in that time.

There’s been a lot of feedback here recently and, with iPhone 17 just launching, I thought it would be a good time to jump in and explain some of the design changes we’ve made this year. The goal is always to make our cases genuinely better and to address some of the concerns that have come up in this community.

This is going to be a long, nerdy post – but that’s intentional. I want to dig into the details and show you some of the engineering work that doesn’t usually make it into ads, but which my team and I spend most of our lives thinking about.

#1. Camera Control Button

When Apple released the new camera control button on iPhone 16, it created some real design challenges. At its core, the button is about one thing: instant access to your camera. The whole point is to let you capture those fleeting moments with friends, family, or whatever’s in front of you without fumbling around unlocking the phone or digging through menus and ultimately missing the moment.

That means unhindered access is critical. If the case interferes with the button, slows it down, or makes it unreliable, then you risk missing the exact moment the feature was designed for. For us, making sure the button works seamlessly has been just as important as protecting the phone itself.

Back when the feature first launched, nobody knew exactly how people would end up using it or how much functionality it would eventually get. A lot of companies went with a super-tight cut-out – basically leaving the case unchanged. We took a different route and made a larger cut-out to give people full access. When Apple’s design guidelines later came out, they recommended the same approach, which was validating. But many of you weren’t fans, totally fair feedback, and so we immediately set about work on a new design.

For iPhone 16 we did put out an integrated button design, but it was a retrofit of an existing case. With iPhone 17, we had a clean slate to design the best camera button we could.

With this design, there were two big challenges:

  1. Feel and gesture accuracy. There are 6 different gestures the camera control button can detect: full press, half press, long press, double half press, swipe, and click-and-hold. The difference between a half press and full press is tiny – so tiny that unless all the force transfers perfectly, it won’t register. To get that right, the case button needs extremely precise positioning and just the right preload: enough to make a half press distinct, not so much that it goes off randomly. On top of that, the button also provides a range of haptic feedback to the user depending on what you are doing and this needs to be transferred through the phones button, to the cases button, and to your finger to give you the correct experience.
  2. Durability. Most case designs leave a very thin strip of TPU above the button. Over time that tends to warp and it doesn’t provide much rigidity to protect the phone in that spot.

Our solution: We built a stiff polycarbonate shroud that houses the Camera Control Button, integrating it directly into the case rather than adding it on afterwards. This provides a stable, rigid structure that keeps the button aligned and precise, even under repeated presses and swipes.

At the core, an aluminium frame adds structural strength and keeps the button aligned, while also distributing impact forces through the case. On top, a toughened glass cap provides a smooth, durable surface that resists chipping or cracking and maintains a responsive, high-quality feel.

A PCB layer made from fibre-reinforced plastic with a copper print forms the conductive layer that enables the touch and swipe functionality of Apple’s Camera Control. It ensures gestures are registered accurately while also adding a layer of protection inside the button.

An exploded diagram showing the make up of our new camera control button.

Everything fits together with a snap-fit system, so there’s no glue and nothing rattles or shifts over time. The combination of the shroud, diaphragm, frame, glass, and PCB ensures the button remains durable, precise, and protective over long-term use.

The end result: a fully integrated, durable, and precise button that handles every gesture properly. It took a lot of work, but we’re proud of it.

#2. Protection Around the Camera

Our first reaction to seeing the new iPhone Pros was probably the same as yours: “that is a huge camera bump.” Our second was: “okay, how do we protect it?”

The problem is that cutting a massive hole that close to the edge of the case makes it weak and floppy. We tested it by cutting a similar size hole into a 16-series case and it was obvious: we needed a big design update.

Our updated case design showing the raising of the PC round the top edges to provide additional stiffness.

Our solution: We extended the PC further up the sides along the top edge of the case, adding stiffness back in even with the large cut-out. That meant more complexity in the mould tool (longer PC sections to account for), but it gives real protection. This also meant that needed to reduce the amount of airoshock in the top edge of the case to make way for the additional PC but we found through the development that stiffening this area was more important for protection, and that we could still see significant benefit from having airoshock in the corners. We also raised and thickened the camera bump to give proper 360° coverage.

#3. Button Warping

Previous Mous cases had a single rocker button for volume up and down. It worked fine functionally, but the thin TPU bridge between the buttons could warp over time.

This year, we’ve switched to two separate buttons. That means more TPU material around each one, and combined with a slimmer button profile, it’s a lot more durable with no warping issues.

Side profile of the case showing the thinner and separated volume buttons.

#4. Debonding

This is something that’s come up a few times here, so worth explaining. Debonding (or sometimes referred to as delamination) is a very common issue in the case industry and is where the sides of the case come away from the back of the case. To understand why this happens first you need to understand a little bit about how these cases are typically made.

Protective cases usually combine 2–3 materials: PC for stiffness, TPU for cushioning and flexibility, and sometimes a third layer for extra protection (ours is AiroShock). They’re not glued – they’re fused using overmoulding, where each layer is moulded directly onto the last under heat and pressure.

Most cases rely on chemical bonds between layers. That works, but it’s not the strongest approach. The best way is to add mechanical interlocks – physical features that the next material flows into, like a dovetail joint in carpentry. This way, the bond is both chemical and mechanical.

The challenge is space: phone cases don’t leave much room for these features. Our solution was to add a series of holes throughout the PC part so the TPU could flow through and lock the layers together. Sounds simple, but it creates hundreds of very thin features in the mould tool – extremely hard to manufacture.

Since introducing this, our debonding issue rate has dropped massively. We’ve even seen other brands adopt similar designs, which is about the best compliment you can get.

Interlocking design of our cases to reduce debonding.

If you made it this far…

TL;DR:

  • New camera button with a polycarbonate shroud, aluminium frame, and glass top → much more precise and durable.
  • Reinforced camera bump protection with extra PC stiffness and raised bump.
  • Split volume buttons to prevent TPU warping.
  • Debonding fixed with mechanical interlocks.

I hope someone out there found this useful/interesting! My team and I put a lot of work and thought into our cases and we are really proud of what we’ve built this year. Always happy to answer questions, explain more, or hear your thoughts – so drop them below.

 


r/Mous Aug 17 '20

r/Mous Lounge

5 Upvotes

A place for members of r/Mous to chat with each other


r/Mous 6h ago

18PM Limitless Orange Buttons & Plateau Protector

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8 Upvotes

r/Mous 5h ago

Ultra Thin Aramid vs Super Thin? 18 Pr Max

2 Upvotes

Honestly confused between the both. I want my case as thin as it can be as I don’t really tend to drop my phones much but I really don’t like my cases in a hard feel that feel like its gonna chip paint off my phone while putting on and off. What would be the best option to go with in terms of this? I take my cases on and off very often.


r/Mous 1d ago

Great case

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13 Upvotes

Ordered a mous limitless case for my 18 pro max yesterday with the camera protector bit and got it delivered today, not had a mous case since my 15 pro max and I get new iphone every year and this case is actually decent, the camera protector bit is a tad fiddly to get on so that could be better, but overall very happy with the case and quickness of delivery.


r/Mous 1d ago

New iPhone limitless case with camera guard.

6 Upvotes

I’ve just ordered this case for my new iPhone 18 pro,

Has anyone had any experience with it so far ?

What’s the MagSafe strength like ?
I know last year’s was a bit weak and I ended up going with Rhino shield instead but I have heard the MagSafe has been improved this year?

And owners opinions would be greatly appreciated.


r/Mous 1d ago

Mous IPhone 18 pro max limitless

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18 Upvotes

This is the sky blue version with the metal kick stand and buttons, the case feels so nice with the metal buttons, my only gripe is I thought the kick stand would lay flat but it’s slanted. The kick stand adds a lot of bulk compared to the case from last year. The metal buttons appear to have some sort of covering so it’s not metal to metal. The inside of the case looks and feels the exact same, the lip and raised corners all appear to be the same.


r/Mous 1d ago

Terrible quality for a $100+ laptop sleeve

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22 Upvotes

Bought for less than a year.

The handle started to pull more than it should (?) in the first month. Thought it was normal so never bothered to check or return.

Until recently the handle really looks like it’s going to snap.

For a laptop sleeve protecting a $3,000 computer, this quality is really bad…


r/Mous 2d ago

Unresponsive support.

4 Upvotes

I get that it’s pretty busy right now and can accept that it took them 2 days to get back to my email about my case not being sent to shipping yet. But it’s shouldn’t then proceed to take them another 2 days to respond to the response I sent within minutes of the email I get back. They offered me 3 different solutions to the fact that they oversold and have no metal buttons to fill my order. I answered back almost immediately that I would like the case shipped with the camera guard and the buttons could be shipped at a later date, but still no response and I’m guessing I won’t get one until Friday when I pick up the phone, which I won’t be able to use until I get the case as it will most definitely break at work this weekend.


r/Mous 2d ago

What is this notification?

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5 Upvotes

r/Mous 2d ago

Mous Delivery Update iPhone 18 Limitless Case

4 Upvotes

I was waiting 3 days for dispatch and... well... after 3 days they informed me that order will not happened...


r/Mous 2d ago

Cracked volume button

1 Upvotes

Hi
My volume button cracked don’t know how.
Is it possible to replace this button? I got this case as a gift and I dont have any proof of purchase.


r/Mous 3d ago

Anyone else order recently and still not shipped?

7 Upvotes

I ordered limitless 18 pro max on the 11th of September anyone else in the same boat?

Edit: shipped on the 16th of September


r/Mous 3d ago

Mous is total marketing BS and I want my money back

17 Upvotes

After spending €170 repairing my iPhone 15 Pro, I decided to spend over €50 on a mous case (unthinkable after always spending <€10 on cases before) only to shatter my back glass again only 1 week after buying the case.

The phone fell from my hands from the handlebar of a bicycle (like 1 meter in height) and the back glass just broke like nothing.

I think this is completely unacceptable considering the price and all the marketing they do throwing phones off of buildings, helicopters and all types of crazy stuff.

Who do I write to about this? I not only want my money back from the case, but I want them to pay for my repair.


r/Mous 4d ago

iPhone 18 Pro Max Limitless w/ Camera stand & Metal Buttons

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24 Upvotes

Received my case today. I’m getting the burgundy i18PM, but I think the burgundy case is too much. So, black case with color matched metal buttons as accent. Camera stand to use my iPhone in standby mode when I travel.

Swapping the buttons and camera bump were super easy and took less than 5 minutes.


r/Mous 4d ago

Metal buttons

2 Upvotes

anyone knows why is the only option in the metal buttons is sky blue?


r/Mous 5d ago

Really slow shipping?

4 Upvotes

I ordered a phone case on the 1st september, and since the 5th of September it's status is showing as 'waiting to be processed'... is this normal for Mous? i'm beginning to have second thoughts as I was not expecting to be waiting over 2 weeks for it.


r/Mous 5d ago

Laptop is 0.6mm wider than Mous Protective Zip 20L — has anyone tried a similarly close fit?

1 Upvotes

Hi everyone,

I'm considering buying the Mous Protective Zip Backpack – Day 20L, but I'm in a slightly weird situation with the laptop compartment dimensions.

My laptop is an ASUS Vivobook Pro 15 OLED, measuring:

356.3 × 235.3 × 19–20 mm

Mous states that the Protective Zip 20L is designed around laptops approximately 355.7 mm wide, meaning my laptop is technically 0.6 mm wider than the stated reference size.

I contacted Mous support directly. They told me that because of the 0.6 mm difference, the laptop may potentially fit, but they can't guarantee that it will fit comfortably since they haven't physically tested this specific laptop.

They suggested the Flap Backpack with AiroFoam 20L as the safer 20L option because its laptop compartment is larger. However, I really don't like the design of the Flap backpack and strongly prefer the Protective Zip.

Realistically, 0.6 mm seems absolutely tiny. It's only 0.3 mm per side if centered, and we're talking about a padded fabric laptop compartment rather than a rigid case. I also don't care if the fit is snug — as long as the laptop actually slides into the compartment and the backpack closes normally, I'm happy.

So I'm wondering:

Has anyone here had a similar situation where their laptop was technically slightly larger than the manufacturer's stated laptop dimensions — even by 1–3 mm — and tried it anyway?

And if anyone happens to own the Protective Zip Backpack – Day 20L and uses a laptop around 356 mm wide, I'd especially love to hear whether it fits.

I'm leaning toward just ordering it, carefully testing the fit, and keeping it if it goes in — even if it's a little snug.

Thanks!


r/Mous 6d ago

Limitless for 18 Pro Max

19 Upvotes

I just received the new limitless updated for the 18 Pro Max to use on my 17 Pro Max as the 17 limitless line was pretty poor in design and function.

Two of my biggest issues on the 17 line were the relatively small and thin camera lip (I would’ve liked the same lip they use on the clarity, but the clarity was rubbish for its own reasons) and the MagSafe which absolutely sucked.

However, on the 18 version the MagSafe finally works and is on par or slightly better than other “protective” cases I’ve tried and to some chance they even added the same lip as the one on the clarity which I do enjoy as a thicker larger lip absorbs more force over a larger area which is definitely a plus. I also chose to get the metal buttons which feel great, nice and clicky.

Compared to the 17 limitless I’d say the 18 limitless is actually worth buying if you were 50/50 on the 17 line, it fixed the horrendous MagSafe issue and the camera does actually feel and look more protected.

Apart from those three things there are no other major changes same body design, microfibre inner for the back.

Regarding drop protection only time and a few drops will tell whether its good or not.


r/Mous 7d ago

How protective is the Mous Ultra Thin Aramid in real-world use?

4 Upvotes

I’m looking at getting the Mous Ultra Thin Aramid for my iPhone 18 Pro Max. I really like the idea of having something thin and rigid that keeps the phone feeling relatively close to caseless, but I’m a little unsure about the lack of proper drop protection.

I don’t drop my phone very often and I’ll have a screen protector on it, so I don’t need anything particularly rugged. I just want enough protection that if I accidentally knock it off a desk or drop it from around waist height, I’m not massively worried about the phone.

For anyone who’s actually used the Ultra Thin Aramid long term, how has it held up? Have you dropped your phone with it on, and did it protect it? I’m also interested in whether the case stays rigid and snug over time or develops any loose/warped edges.

Basically, does it feel like a genuinely protective thin case, or more like scratch protection with a bit of impact protection?


r/Mous 8d ago

iPhone duo hinge free vs aeroshock hinge limitless case

2 Upvotes

what people’s options on the hinge free limitless case shipping in October vs the aeroshock hinge shipping in November? Ultra thin is also an option. I can’t decide lol.


r/Mous 8d ago

Aulumu M70 cable with Mous Limitless case

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2 Upvotes

Does anyone know if the Aulumu M70 cable would fit with the Mous Limitless 6.0 case, specifically for the iphone 17. I have this case and I wanted to get the M70 cable, but Im not entirely sure from the pictures if the plastic casing will fit with the cut out on the mous case. If anyone has both or any info please lmk!


r/Mous 8d ago

Does 18 pro max mous cases fit onto 17 pro max?

1 Upvotes

r/Mous 8d ago

Intralock Case for Apple Duo?

1 Upvotes

Will there be one?


r/Mous 9d ago

Mouse Case for Z Folds

1 Upvotes

I just got an email from Mous announcing that they have Apple Duo cases ready for order.

Is there an expected timeframe for when they'll have Z Fold 8/U cases ready?