Title: Very effective, but order a size down
Review: I was shocked at how effective this product is in keeping my shirts clean and free from sweat stains. I'll probably order a few more, but next time order a size down. A medium shirt is generally form-fitting for me, so that's what I ordered, but this one was actually pretty baggy--not what you want from an undershirt. So I'll go for the small next time. Also, it works better under a little larger or thicker shirt.
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