Talked to a rep at Westone about there #39 ear plugs. They are the ones that have the sonic valve in them with no hearing amplification. From my understanding it is the amplification circuit that causes problems with wind and grass/corn field nosies. They are about $75 an ear. He said that when the valve is not closed you can except a 25db reduction in high frequency noises. He stated that if you currently had good hearing this 25db reduction would still put you in the average range of hearing that is considered exceptable for normal hearing.