Which Waterproof Rating Do I Need?

If you’re shopping for outdoor gear - such as a waterproof changing robe - you’ll often see products advertised with their own distinct waterproof rating. But how do those numbers actually translate into your gear’s practical application, and more importantly, which waterproof rating do you really need? 

What Is a Waterproof Rating?

Waterproof ratings are usually given in millimetres (mm) and represent the volume of water pressure a fabric can withstand before it starts to leak. A higher number means more protection - but it also often means heavier, less breathable material that requires advanced technology to maintain wearer comfort. You can read about the specific details for a technical breakdown in our previous guide.

Here’s how common waterproof rating bands map to real conditions:

5,000-10,000 mm: Light Water Protection For Everyday Use

These fabrics keep you dry through unpredictable, light weather without adding unnecessary weight or cost. Breathability is usually good, which makes these ideal for casual users. 

Best suited for:

• Light rain and drizzle
• Short walks or commutes
• Urban use

10,000-15,000 mm: Great For All-Round Outdoor Use

A decent sweet spot for casual outdoor activities. 10,000-15,000mm provides solid waterproofing through sustained rain while still delivering decent breathability. This band is aimed towards entry-level day-to-day activity, suitable for hikers, campers, and travellers in most scenarios. It might not be up to facing the toughest conditions out there, but a lot of the time, this rating will get the job done.

Best suited for:

• Moderate rain
• Full-day hikes
• Cooler, changeable conditions

15,000-20,000 mm: Suited To Heavy Rain And Touring

When you need serious protection from the elements for activities such as changing after open water swimming, winter mountaineering and more, this band gives you everything that you need. You’ll find equipment such as the EVO Pro Waterproof Changing Robe and EVO Pro Slimline Waterproof Parka Jacket, which combine waterproofing with high breathability and phenomenal durability. They’re designed for optimal performance in harsh conditions, while still being perfectly suited to casual wear too. 

Best suited for:

• Heavy, prolonged rain
• Snow, wet winter conditions
• Mountain and alpine environments

What About Breathability?

Your waterproof rating is only one half of the solution, though. A highly waterproof fabric that doesn’t breathe can leave you soaking on the inside from sweat, which nobody wants. That’s why the breathability rating on your waterproof changing robes and other outdoor gear is so important. Make sure you’re checking both ratings to make sure you’re getting good gear.

We hope this guide on how to choose your waterproof rating has been helpful. If you need more information on waterproof gear, breathability and more, then you can rest assured that we’re happy to help. You can get in touch with the Red Equipment team for guidance on all things waterproof today.