Depending on where you buy them, they may come with an extra low light lens, most likely clear or yellow. For night I would definitely use just a clear lens but if you won't something more versatile in low light conditions I would check out the yellow/blue Ion lens. It's not as dark as it looks on the Dragon website
Replacement Lenses for Goggles and Sunglasses
Now giving away a free beanie + stickers with every Spy goggle purchased!