![]() ![]() The higher the figure attached to the fabric, the more breathable it is – i.e., 10,000 g/m²/24 means that 10,000 grams of water passed through one square meter of fabric over the course of a day, whereas 20,000 g/m²/24 means twice as much water passed through.īut how does that help you choose a waterproof jacket?įor a better idea of how different breathability ratings translate into performance in the field, take a look at the following:ĥ,000-10,000 g/m2/day – Jackets with MVTR breathability ratings in this range are suitable for low-output activities and general outdoor use but not breathable enough for more aerobic activities like trail running or more intense hiking.ġ0,000-15,000 g/m2/day – Ideal for more active use in high-output activities, including hiking, ski touring, and mountaineering.Ģ0,000+ g/m2/day – The best bet for use in warmer climates or for more intense aerobic activities like trail running or ski-mountaineering. This is typically shown in product specifications as “g/m²/day” or “g/m²/24h”. The MVRT of any fabric is gauged by measuring the quantity of water vapor that seeps through it over a 24-hour period in laboratory tests. Two types of breathability ratings: MVTR & RET Moisture vapor transmission rate (MVTR) Once the membrane is added to the garment, the fabric’s degree of breathability is then quantified using one of two methods: the Moisture Vapor Transmission Rate (MVTR) or the Resistance to Evaporative Heat Loss (RET). This technical wizardry is what gives our wet-weather togs the ability to simultaneously fend off airborne liquid (see What is hydrostatic head?) while also conveying the kind produced by our bodies to the fabric’s exterior to evaporate. ![]() Waterproof-breathable membranes are incredibly thin films, coatings, or sheets of material that have, quite literally, billions of microscopic pores that are too small for rainwater to penetrate but large enough to allow water vapor molecules to escape outward. ![]() A Gore-Tex membrane sandwiched between the liner and face fabric (Image credit: Gore) ![]()
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