A team of engineers from the University of Minho in Portugal have modified cotton fabric so that it that actually smells better the more you sweat. Yep, the fabric releases a citronella scent when it comes in contact with sweat.
Researchers modified both the protein and the fat-like liposomes to physically release citronella scents when they come into contact with the acidic qualities of human sweat. The protein solution, according to their research, let off a "quick burst of scent" while the liposome solution slowly released the scent over an extended period of time. "Both strategies revealed high potential," the study reports. "Functional textiles incorporating fragrances could be an effective clothing deodorizing product."
In other words.. you'll smell great!