This article from Men’s Health Magazine explains part of the problem with sweating while wearing wicking fabrics. They do a great job of laying out why odors can stick to your favorite sports apparel.

They give only a partial solution to this problem, though. If you’re looking for a way to completely restore your high-performance sports apparel, and then protect it from future odors, OdorBalance is the answer. Restore, Protect and Maintain with odor protection that lasts. Attack the source of the stench in your sports apparel, gear, or footwear that keeps your family, friends and teammates at a distance. Use our complete odor management and cleaning system.

MY GYM SHIRT SMELLS ONCE I START TO SWEAT. WHAT’S THE FIX?
-BARRY, ANN ARBOR, MI
We haven’t peeked into your gym bag (recently), but we bet you have a wicking shirt stuffed in there. Wicking fabric is described as “hydrophobic” because it moves moisture away from your skin–good for staying dry in the gym but bad for BO, says Kay Obendorf, Ph.D., a professor of fiber science at Cornell University. “The oils in your sweat are also hydrophobic, and they’re much harder to remove from another hydrophobic surface than from something that absorbs water, like cotton or wool.” That would be fine, except that your skin’s oils contain lipids, cholesterol, fatty acids, and ammonia–a veritable buffet for stink-producing bacteria. Our advice: Chuck your shirt and buy one of the options we list here. Now, if you’d rather try to save that smelly rag, Obendorf recommends using the longest, hottest wash cycle the fabric can take (check the tag) along with a sport detergent, such as ProWash Activewear Detergent ($10, drugstore.com). The combination of heat and extended immersion can help break down the stubborn oils, while the sport detergent is less likely to leave behind chemical residues that can trap the stench.

Read more at Men’s Health: http://www.menshealth.com/best-life/gym-shirt-smells#ixzz1mc6KbNLt