For a 100% result, wear modern synthetic materials
Modern synthetic materials, which favorably combine waterproofness, breathability and light weight, ensure that you are neither too cold nor too warm. You will wear three basic layers. In case of weather changes, you can easily remove the layer or pull it on and still remain comfortable. And so that you don't kill the function of a perfect quick-drying t-shirt with a non-breathable jacket, make sure that the individual layers also support each other during thermoregulation.
The second layer keeps your body temperature in optimal comfort
The task of the insulating layer is maintain thermal comfort and most often it will be sweatshirts made of fleece and microfleece. Clothing in this layer should be light, flexible and breathable to support the functions of the first layer. However, it must not lose its ability to insulate heat. Sweatshirts with a so-called grid structure are also popular.
The third layer protects you from rain and wind
The third layer of clothing serves as protection against adverse environmental influences. Water resistance and wind resistance while maintaining good breathability are important. For protection against the wind, you can rely, for example, on clothing made of softshell material.
If you are looking for reliable protection against water, bet on jackets and trousers with a membrane and taped seams.
Do not look for 100% waterproofness in functional clothing, it can only be ensured with a thicker plastic raincoat. However, we only recommend it in a state of extreme emergency. When moving in such plastic, you would very quickly find out that in addition to being completely waterproof, the plastic is also 100% non-breathable. Your heat and sweat have nowhere to escape and you end up staying just as wet. Not from the rain, but from your own sweat.
In order for the top layer not to spoil the functionality of the previous layers in sweat removal, this one must also breathe well. Material Water Vapor Permeability (MVRT) indicates how many grams of vapor evaporate over 1 m² of material in 24 hours (g/m²/24 h). The higher the MVTR value, the more breathable the material is (ISO 2528).
What breathability value is ideal for clothing for mountain hiking?
Low and medium intensity of movement - from 5,000 to 10,000 g/m²/24h For example, it will be a walk in the city, light hiking, flat and slightly undulating terrains.
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Difficult terrains and high intensity of movement – over 10,000 g/m²/24 h These will be mountain and alpine terrains with high gradients, rocky terrain, all-day demanding ascents.
Mountain pants hiking
Layering clothing on the legs is more a matter of winter hiking, skiing (thermal underpants) or skialpe (warmer shorts or skirts). Pants for mountain hiking are worn directly on the body and fulfill the function of a third, protective layer.
Therefore, choose them so that they protect you from wind and water, they are also excellently breathable and quick-drying, and they should not restrict your movement. Such properties are well met, for example, by an elastic softshell possibly supplemented with a membrane.