Two iPhone 11 Pro Max phones in Catalyst Case US waterproof cases, Stealth Black. The front phone shows its app-filled screen; the rear displays the Apple logo and triple cameras. Both stand upright, emphasizing case durability and design.
Under "Compatibility," the iPhone 11 (6.1") and iPhone 11 Pro (5.8") have red Xs, while only iPhone 11 Pro Max (6.5") has a green checkmark, showing this Catalyst Case US Waterproof Case fits only iPhone 11 Pro Max.
The Catalyst Case US iPhone 11 Pro Max Waterproof Case is shown with water splashes, highlighting its waterproofing: “5X More Waterproof Compared to Leading Competitor.” Icons show depth: 6.6 ft vs 33 ft. An iPhone sits inside the case.
The Catalyst Case US iPhone 11 Pro Max Waterproof Case is shown from the back and side, highlighting its clear back, slim design, and anti-drop lanyard. The light blue background features abstract shapes.
Exploded view of the Catalyst Case US iPhone 11 Pro Max Waterproof Case shows three layers: clear top with “Waterproof Seal,” middle with phone, bottom frame labeled “Touch Screen Film,” plus an attached wrist strap.
An iPhone 11 Pro Max in a black Catalyst waterproof case rests on a lavender surface. Labeled callouts highlight the mute switch, non-slip edges, and “True Sound” near the charging port with a cable plugged in; the screen shows colorful app icons.
An iPhone 11 Pro Max in a Catalyst Case US waterproof case is mounted on a MagSafe-compatible wireless charger. The screen shows "75% Charged." On the left, text reads "MagSafe Compatible Wireless Charging" with a charger icon above it.
The Catalyst Case US iPhone 11 Pro Max Waterproof Case in black, featuring a clear back and attached lanyard, is shown with camera and port openings. Above, bold "Lanyard Included" text appears on a light beige background.
The image shows the front and back packaging of the Catalyst Case US iPhone 11 Pro Max Waterproof Case. The front highlights a surfing man and key features, while the back presents product details, icons, and a case component diagram.
Wearing a neon green jacket, black gloves, and ski goggles, a person takes a selfie outdoors in snowy mountains using an iPhone 11 Pro Max with a Catalyst Case US waterproof case; snow and sky reflect in the phone.
Two iPhone 11 Pro Max devices in black Catalyst Case US waterproof cases; one shows the home screen, the other displays the back camera lenses. A transparent screen protector is partially visible beside the front-facing phone.

iPhone 11 Pro Max - Waterproof Case

Sale price$89.99 USD4.8
Color: Stealth Black

add another $75.00 to get free shipping

Trusted by thousands of users

"Do you want to take cool under water videos? - Then this waterproof case from Catalyst is the perfect solution"

image not available Kara (@karas_adventuress)
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"Well I couldn't withstand the 50 degree water but the Catalyst case could. Thank goodness - I am so exited!"

image not available Colt (@ colt.dayne)
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"Dude, that thing got launched. Look at this. OMG, it's just dust. Everything is completely fine. That's crazy!!!"

image not available Andrew (@andrewtheparkrat)
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Talk about perfection

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Definitely a book you can judge by its cover

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The most robust iPhone case ever made

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An impenetrable bubble for your phone

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Total Protection case certainly measures up to its title

Real Customers, Proven Protection
See Their Photos Now!

A person snorkeling underwater, equipped with goggles, a snorkel, and their iPhone secured by Catalyst's black Waterproof Case and a floating wrist lanyard. They're capturing photos of the stunning backdrop of rocks and coral.
Someone grips an iPhone with a Catalyst Total Protection Waterproof Case (Black) on a beach, where waves gently lap the shore and another beachgoer meanders in the background.
A Catalyst iPhone in a vibrant red, waterproof case offering total protection is partially buried in the snow, tilted against a snowy backdrop under a cloudy sky.
A hand grips an iPhone snugly encased in a Catalyst iPhone - Waterproof Case, Total Protection, in Glacial Blue. Expertly designed to keep water out, it's submerged underwater with a floating wrist strap for safe capturing of aquatic wonders.
An iPhone 16 Pro Max, shielded in Catalyst's black waterproof case, is submerged underwater against a serene blue backdrop.
Catalyst iPhone waterproof case in black half submerged in water.
A red Catalyst iPhone Waterproof Case, Total Protection, expertly designed against water and dirt, submerges with its logo and cameras visible amid ripples and bubbles.
A woman snorkeling in a yellow suit and goggles captures vibrant marine life with an iPhone in a black Catalyst waterproof case.
" Beautiful photos through case, underwater & above, kept phone bone dry. "
"...multiple times daily - alcohol sanitizer, germicidal wipes, or surgical scrub soap - without worry."
" Works on gimbal, Lidar functions great. Survived drop on tiles. Works in the pool too. "
" I have 3 boys, needed the best case. Dropped phone multiple times in 6 months! "
" Best case ever; worth buying to keep phone water-free. "

Specification

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6.69" x 3.46" x 0.47" (17.00cm x 8.80cm x 1.20cm)

Compatibility

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  • iPhone 11 Pro Max
  • Not compatible with the iPhone 16 Series, iPhone 15 Series, iPhone 14 Series, iPhone 13 Series, iPhone 12 Series, iPhone 11,  iPhone 11 Pro, iPhone X Series, iPhone SE (Gen 3/2), iPhone 8 Series, iPhone 7 Series, iPhone 6 Series, iPhone 5/SE Series

Features

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  • 33ft waterproof (IP68)
  • 6.6ft Drop Proof (MIL-STD-810G)
  • Snow / Dirt / Sand Proof
  • Wireless Charging Compatible
  • Highly Responsive Touchscreen
  • Face ID Compatible
  • Clear Back Panel Showcases iPhone
  • Hard-Coated Optical Lens for Clear Photos
  • True Sound Acoustics for Clear Calls & Noise Cancellation
  • Rotating Mute Switch & Easy to Press Buttons
  • Lanyard Attachment Point
  • Wrist Lanyard Included (pull-tested to 10kG)
  • Charge Port Fits 11.5mm x 5.9mm Cables
  • Washable with Soap & Water
  • Cleanable with EPA-approved Disinfectants (70% isopropyl alcohol, 70% ethanol, Lysol® Wipes, Clorox® Wipes or OptiCide 3® Wipes. Avoid povidone-iodine cleaners)
  • Premium Non-Slip Rubber Exterior
  • Easy to Install & Remove

What is in the box?

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  • Case Front x 1
  • Case Back x 1
  • O-ring x 1
  • Wrist Lanyard x 1
  • Plug x 1
  • Instruction Manual x 1

Compliance

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  • REACH Compliant
  • ⚠WARNING: This product contains bisphenol A (BPA), a component of polycarbonate (PC). BPA is a chemical known to the State of California to cause reproductive harm, primarily when exposure occurs at elevated levels over prolonged periods. For more information, visit www.P65Warnings.ca.gov.

Frequently Asked Questions

How easy is it to install a Catalyst Waterproof Case on my iPhone?

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Will the case fit my iPhone?

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Does it protect against water, drops, and impacts?

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Can I use my waterproof case with a screen protector on my iPhone?

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Does the case support the speakers & the microphone of my iPhone?

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Does the built-in screen protector mess with touch sensitivity?

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Are the buttons easy to use with the case on?

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How do you take underwater pictures and videos with your case?

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Can I use wireless charging with the case on?

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What can I use to clean and disinfect the waterproof case?

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What does IP68 mean?

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What does MIL-STD-810G mean?

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What are your waterproof cases made of?

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How Can I Prevent My iPhone from Sinking to the Bottom of the Ocean?

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What are the most common everyday uses for a waterproof case?

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