Breathable garments allow a certain amount of moisture and vapour to be released. Levels of breathability range from 1000 – 25000 and is measured by how many grams of water vapour are able to pass through a fabric in 24 hours (MVT = moisture vapour transmission)
This garment is 5000 gms/m2/24hr

Moisture vapour transmission relies on the existence of a temperature/pressure gradient between the inside and outside of the breathable layer. In other words the fabric works by equalising the pressure and heat between the inside and outside of the garment.
Once the body moisture reaches the inner face of the garment, it must pass through the fabric and then evaporate on the surface. If the rate of transmission is slower than the rate of extra vapour condensation can form on the inside

Breathable garments will not “stop” you sweating or producing moisture. This is a natural response. Breathable garments do allow drying to happen more quickly

Breathable garments work best at preventing condensation build up if they are reasonable tight fitting. This is because if the mid and outer layers are not in contact then moisture can come into contact with cooler pockets of air, so promoting condensation on the inside.

Breathable garments work best with manmade undergarments rather than cotton. This is because of the better wicking qualities taking and keeping the moisture away from the body

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