Summer means heat, and heat means sweat.
Sweat, of course, is a good thing. It's your body's way of cooling off, so you don't necessarily want to douse yourself in antiperspirant before braving the sun.
On the other hand, you also don't want to spend all day bathed in your own perspiration, either.
Naturally derived fibers like cotton and bamboo do what those high-tech sports shirts advertise:
they soak up the sweat from your skin, and then quickly evaporate it so that you stay dry and cool all day long.
Instead of walking around with a sweaty stain down your back, the fabric releases the moisture - and your body heat - into the atmosphere.
You can find socks made from bamboo fiber to keep your feet healthy and happy...
And, obviously, bamboo tee shirts.
Light colors tend to feel a little bit cooler, but they also block less UV radiation so you're more likely to get a sunburn through your shirt if you opt for the basic white tee.
If you need more inspiration, you can find it here on Lifehacker:
Those overachievers picked 10 ways to beat the heat instead of our 5...but theirs probably wasn't written by a cartoon panda, so who's the real winner?