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"All of our fabrics allow a certain amount of air to exit the garment, which depends on the specific style. All of our Winblocs will be breathable, but not as much as a Wind Pro. Polartec® Wind Pro® offers a great amount of wind resistance (4 times more than traditional fleece), and is also very breathable so that when you are active in cooler weather you won’t build up much sweat underneath. Again this might vary depending on exact style as some Wind Pro® fabrics are lofted on the inside and are extremely warm, and some have just a small amount of insulation. The amount of insulation on the inside will change your view of how breathable and warm the jacket is.
Polartec® Power Shield® is designed to block between 96 and 99% percent of the wind depending on the type of Power Shield®. Power® Shield 02® blocks about 96% percent of the wind and is better suited for highly aerobic activities, and Power Shield® Pro blocks 99% of the wind and is more ideal for a backcountry ski jacket or for when you don’t need something that is 100% waterproof and windproof. Our other Power Shield® fabrics fall between these two and are a great blend of weather protection and breathability.
To answer your question on Power Stretch®. It is true that it provides a bit of protection from a wind-chill, especially in activities such as hiking in fall or spring. Shoulder seasons when it isn’t too cold or hot, but when you need to reduce the wind chill a bit. It is a very breathable fabric and I wear Power Stretch® a lot hiking on days where I need the breathability, but also need to block a bit of wind. When you’re at the summit or when the wind is really whipping, you will definitely feel it. But perfect when you’re on the move."