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By: Andrew Forrest - February 2025
The difference between waterproof and water-resistant trousers isn't always clear for many hikers - until they're caught in unexpected rain. Choosing the right trousers can mean the difference between a comfortable, enjoyable trek and a cold, soggy ordeal.
Whether you're a weekend rambler or an experienced hiker tackling all-weather hikes, understanding this distinction is key when shopping for waterproof trousers. This guide breaks down what these terms really mean, how each performs in different conditions, and which option best suits your walking needs.
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Although waterproof and water-resistant are often used interchangeably, they are not synonymous. The key difference lies in the fabric's construction. To easily distinguish them, it's important to grasp their specific definitions.
Several pairs of waterproof trousers
Waterproof walking trousers are engineered to keep you completely dry, even in heavy rain. They achieve this through:
Gore-Tex label on waterproof trousers
Sealed seam inside a pair of waterproof trousers
| Hydrostatic head rating (mm) | Classification | Protection level |
| 0mm | Not water-resistant | No protection against rain |
| 1,500mm | Water-resistant | Light rain or drizzle; suitable for short periods |
| 5,000mm | Waterproof (Basic) | Moderate rain for short or medium periods; suitable for average weather conditions |
| 10,000mm | Waterproof (Standard) | Prolonged moderate rain and heavy rain for shorter periods |
| 15,000mm | Waterproof (Advanced) | Heavy rain and snow; suitable for demanding conditions |
| 20,000mm+ | Waterproof (Extreme) | Heavy rain, wet snow, and high pressure; suitable for extreme and sustained exposure |
Storm flaps to protect the zips from water igress on waterproof trousers
While higher hydrostatic head ratings signify improved waterproofing, elements like fabric breathability, seam sealing, and garment construction are equally vital for overall performance. Moreover, real-world factors such as wind and movement can influence a garment's waterproof effectiveness.
Mountain Equipment water-resistant trousers
Water-resistant trousers, on the other hand, provide limited protection and are best suited for light rain or brief showers. Key features include:
Softer more comfortable fabric inside water-resistant trousers
| Feature | Waterproof trousers | Water-resistant trousers |
| Protection level | Fully waterproof | Resists light rain |
| Breathability | Moderate to high (depending on technology) | High |
| Weight | Heavier | Lighter |
| Best for | Prolonged rain, wet climates, winter hikes | Short showers, fair-weather walking |
| Durability | Long-lasting with maintenance | DWR coating wears off over time |
The different waist fastenings on waterproof and water-resistant trousers
One other main difference is that water-resistant walking or hiking trousers can be worn on their own whilst out walking, but waterproof trousers are generally used just as an outside layer, so they are nearly always paired with something underneath them.
Water-resistant walking trousers can be worn on their own on walks, and for the majority of my November to March walks, I wear walking trousers - shorts take over for me April to October. If it is likely to rain and I am out on a long walk, I still wear walking trousers but have a pair of waterproof trousers in my backpack. Then when it starts raining, I will put the waterproof trousers on over my water-resistant walking trousers, so they can be worn together.
Waterproof and water-resistant trousers side-by-side
Understanding the materials behind these trousers can help you make a better choice.
Non-protected zips on water-resistant trousers
Most decent waterproof trousers are generally durable but require maintenance to retain their effectiveness.
Water-resistant trousers may wear out faster, particularly the DWR coating, which requires reapplication over time.
Check out our clean and reproof waterproof trousers guide for a full breakdown of how to clean and reproof your trousers, including what products to use and how to dry them.
Whilst waterproof trousers excel in keeping water out, that doesn't allow for many features, as the outside shell needs to be protected.
Water-resistant trousers on the other hand generally have a better fit and can come with articulated knees, for more freedom whist walking, they have accessible pockets and can have ankle zips to allow better fitting around different sized boots.
Ankle zips on water-resistant trousers to fit larger boots, but not protected by storm flaps, so potenetial weak point for water ingress
Articulated knees on water-resistant hiking trousers, to allow the knees to bend easier
Budget-friendly options
Water-resistant trousers are generally more affordable, making them a good choice for casual walkers or when you know you will only encounter light rain showers.
Investing in quality
Investing in high-quality waterproof trousers can prevent discomfort and extend their usability. I strongly recommend waterproof trousers over water-resistant ones for hiking in hills, mountains, or exposed places or for regular walking in bad weather.
Choosing between waterproof and water-resistant walking trousers depends on your hiking habits, the climates you frequent, and your budget. Water-resistant trousers offer breathability and comfort if you primarily walk in mild, mainly dry conditions.
However, waterproof trousers provide the ultimate protection if you venture into wetter environments or hike for extended periods. Remember, they do not have to be an either/or choice, you can wear waterproof trousers over your water-resistant hiking trousers.
My view is that if you spend any time out on the hills in the UK, you will get wet at some point, so you should invest in some waterproof trousers as well as general water-resistant walking trousers. Understanding their differences allows you to invest wisely and enjoy your walks, no matter the weather.
February 2025
