The Lancer Tactical SI Ballistic goggles are a great product to get if you are looking for a clear view advantage and not have to worry about fogging. The built in fan on the goggles are operated by one AA battery and the fan itself is very silent and allows the lens to stay clear so you are able to have a better view. The lens themselves are ballistic rated and full seal so you know that they will be allowed on any field you play. Another cool thing about these is that you get two separate lens with them so you can play in any type of weather.