Lots of complicated and expensive solutions are sold to combat this problem. Mic cut-off switches, conversions to put push-to-talk functions onto the intercom, and frequency filters - but sometimes the simplest solution is the one that works best. Simply covering the microphone windsock with a hard shell, leaving a small opening directed at the rider's mouth, will do an AMAZING job at cutting down on the environmental noise!

CycleGadgets.com now has an extensive, inexpensive line of microphone windsock covers to fit most windsocks. Some of the common windsock / headset brands are listed below, but if yours isn't listed explicitly just check the dimensions. You want a deflector that is about 1/8" to 1/4" smaller than the diameter of your windsock - the deflector should fit tightly and should compress the foam of the sock. Choose a length that is approximately the same as your windsock - this measurement isn't as critical, so just get close. We have some specially shaped models to fit teardrop shaped socks, such as the Air Riders, so look at the overall shape too (click on the thumbnails to see enlarged photos of each model).