Anti-Snoring T-shirts are ideal if you want to find out whether positional therapy will help you. Anti-Snoring T-shirts prevent you from snoring while lying on your back. When you lie on your side your tongue can’t slide down the back of your throat, and cause narrowing or blocking of the airways, which in turn, causes snoring. Snoring T-shirts are worn like a normal T-shirt and are therefore quite inconspicuous. A further advantage of snoring shirts is that they are relatively inexpensive.