Gone are the days of the baggy cotton shirt and the cotton track pants. Runners now resemble superheroes in their bright, fitted, sexy running apparel engineered using specially designed synthetic fibres. But for all the science, technology and innovation that goes into a pricey glow-in-the-dark running shirt, there is one flaw the running companies can’t seem to iron out. One run and that shirt is done, off to the laundry basket smelling like you failed to wash it for a month. So resist the urge to scoff the next time you see a runner in a cotton t-shirt. She’s being frugal and in more ways than one. Think of the money she’s saving on detergent.