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Brise soleil, sometimes brise-soleil (; ), is an architecture feature of a building that reduces its solar gain by deflecting incoming sunlight. The system allows low-level sunlight to enter a building in the mornings, evenings and during winter but cuts out direct light during summer.
In the typical form, a horizontal projection extends from the sunside facade of a building. This is most commonly used to prevent facades with a large amount of glass from overheating during the summer. Often are incorporated into the shade to prevent the high-angle summer sun falling on the facade, but also to allow the low-angle winter sun to provide some passive solar heating.
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