Buying waterproof trousers: everything you need to know

Weight and packing dimensions

A lightweight model weighing around 250 grams is ideal as a ‘just in case’ option. These don’t take up much space and aren’t heavy to carry. You can also get ultra-light waterproof trousers that weigh less than 100 grams. However, they aren’t very durable and are purely for use in ‘emergencies’.

Robust models for challenging adventures in rugged terrain are heavier and have a larger packing size. They weigh around 350 g.

Before buying, think about what you’ll mainly be using the trousers for and decide how big and heavy you need them to be. Generally speaking, the lighter the trousers, the less durable they are.

Layers and membranes

As with waterproof jackets, you can get waterproof trousers with two, two and a half or three layers. Three-layer models are the most durable: they’re suitable for trekking and Alpine tours through rocky terrain or for ice climbing. Two-layer and two-and-a-half-layer designs are particularly popular for occasional use. All the information about the different layers, membranes and the proper care of hardshell products can be found in the advice on waterproof jackets.

Water columns for waterproof trousers

Water columns work in the same way for all waterproof fabrics. This is described in more detail in the advice on the waterproof jackets. Because rain falls less heavily on the legs than on the upper body, a lower water column than for jackets is usually sufficient for trousers. The following information is a rough guide:

• Day-to-day life and easy walks with brief rain showers: 10,000 mm

• Trekking and cycling: 10,000 to 20,000 mm

• Alpine tours/continuous rain: 20,000 mm or more

Breathability

If you’re going to be wearing the waterproof trousers for sporting activities such as hiking, high breathability is important. Breathable materials allow water vapour generated by physical activity to escape from the inside to the outside. This prevents moisture from building up in the trousers and stops you from getting wet in spite of the waterproof trousers – not because of the rain, but because of the sweat.

Fit and size

Waterproof trousers are often worn over other trousers, such as cycling trousers, hiking trousers or touring trousers. However, you don’t need to go up a size in waterproof trousers: the manufacturer has already taken this into account, so the size of the waterproof trousers corresponds to your usual dress size.

Make sure the trousers are long enough to cover the trousers you’re wearing underneath. This stops them from getting wet and slowly becoming sodden with water. You can also prevent this by rolling up the cuffs of the trousers underneath.

Waterproof trousers by activity

Cycling: waterproof trousers for cycling often have a reinforced crotch and seat. It’s important that the trousers either fit tightly around the lower legs or can be adjusted to do so using zips or Velcro, say, to stop them from getting into the chain. Pre-shaped knees also ensure the necessary freedom of movement when pedalling.

Alpine touring: choose sturdy trousers that won’t fall victim to rugged rocks. Ideally, the trouser legs would be reinforced at the bottom and thus also protected from crampon spikes.

Trekking: lightweight trousers that can be rolled up small. For an Alpine tour, however, you still want them to be robust.

Easy hikes/everyday life/walks: provided you’re primarily packing the waterproof trousers ‘just in case’, a lightweight model with a comparatively low water column will suffice.

Features

Side zips: many models of waterproof trousers have zips along the sides of the legs. This makes it easier to put them on and take them off, because you can leave your shoes on.

Waistband: lots of waterproof trousers have an elastic waistband. This is important to ensure that there is enough space for the trousers underneath and so you can tuck your top into the trousers.

Pre-shaped knees: it’s important that the waterproof trousers don’t restrict your freedom of movement for cycling, but also hiking and other activities. That’s why you can get models with pre-curved knees that are ideal for particularly active adventures.

Cuffs: many models of waterproof trousers have an elasticated cuff or Velcro at the bottom to prevent the trousers from sliding up and ensure they stay flush against your shoes. Waterproof trousers with a small hook at the bottom are ideal for high-altitude Alpine touring, where you might even need to cross a snow field while wearing your trousers and sink in a bit. Attach this hook to your shoelaces and use it to secure the trousers in place.

Reflective patches: when it rains, it can be gloomy and visibility can be restricted. Reflective patches make you more visible – especially important if you’re going to be cycling on busy roads.

Seat mat: this isn’t part of a pair of waterproof trousers, but can come in handy when trekking, for example. When you sit on wet terrain while your waterproof trousers, you’re literally pushing the water through the fabric with your body weight. Depending on the water column, you’ll get wet sooner or later, but a seat mat will keep you dry and warm.

Waterproof trousers for kids

Waterproof trousers for children often have additional features. When buying, look out for:

• Dungarees: waterproof trousers designed as dungarees keep little ones dry, even if their jacket slides up when romping around on the floor.

• Elasticated cuffs: many models of waterproof trousers for children feature an elasticated cuff that can be stretched around their wellington boots to prevent the trouser legs from slipping up.