This Polarizer is part of our new glass Naked Filter line which slides onto the Hero3 camera lens. This is only for filming when the Hero3 is outside the waterproof housing, or while in the "Frame" housing. This filter has a glass lens for razor sharp optics as well as maximum scratch resistance. A polarizer filter is the most popular filter for photography and now you can use one with your GoPro Hero3 camera. A polarizer is designed to reduce glare and increase color saturation leaving you with sharp, crispy, footage. Whether shooting cinematography in the wild, or sending cliffs in the backcountry, this polarizer filter is sure to give you the best looking video possible.