I have an older Gore Windstopper jacket that doesn't breath well and a couple of Castelli jackets made partially of Windstopper that do breath well. Issue might be that there are four types of Windstopper fabric:

There are four basic categories of WINDSTOPPER® fabrics:


• WINDSTOPPER® Active Shells are the lightest, most packable garments, offering total windproofness, maximum breathability, and water resistance. They keep you comfortable for enhanced performance during highly aerobic activities.

• WINDSTOPPER® Soft Shells offer total windproofness and maximum breathability, combining the comfort of a soft mid-layer and the water resistance of a shell in one garment. They keep you comfortable with the freedom of movement you need for enhanced performance in a wide range of activities and weather conditions.

• WINDSTOPPER® Technical Fleece provides more warmth and comfort than non-windproof fleece with less bulk by combining total windproofness and maximum breathability. It's effective as a mid-layer or outer layer, keeping you warm and comfortable in cool and windy conditions.

• WINDSTOPPER® Insulated Shells provide lightweight warmth by combining total windproofness, maximum breathability, and water resistance. They are designed to keep warm air in and the cold wind out, while allowing perspiration to easily escape. They are ideal for cold and windy conditions.

From here: FAQ - WINDSTOPPER® Products