http://auphonix.com/bestfilter It's an error that numerous beginners make when starting out with audio. No matter whether it is speaking or singing, there is a problem common to all audio recording. The dilemma is plosives. Plosives are these sounds that have a sharp exhalation of breath when they are spoken. The most common are the letters P and B. Try placing your hand in front of your mouth and say them. You will really feel the air hit your palm. When this same air hits a microphone , it causes popping. This can come across as a thud sound and it is just horrible when you replay your audio. The answer is basic - a basic pop filter, preferably a dual mesh, efficiently diffuses the air and stops the thuds. Get yours today, you will not regret it!
Auphonix sells a wonderful pop filter on Amazon. Click the hyperlink above in the description, which will take you directly to the listing, or go on to Amazon and search on Auphonix pop filter.