We love running in cotton T-shirts—and so should you. Here's how to score a free Runner's World cotton T-shirt and join the movement.

Not just any T-shirt will do, however. You cannot just reach into your gym bag and come up with an option. You need to consider cut, fabric (sheer is probably not a good idea for the office) and ...

Not having to iron a cotton shirt, which also sheds biodegradable fibre in the environment rather than synthetics when washed, could become a reality in the future with a new CSIRO project underway.