I'm going to disagree with some of the posts - men need a yoga mat that's tailored to them, both in design and style. Look, this is the same as when you buy a men's pair of running shoes to exercise as opposed to women's, or jogging shorts instead of tight spandex hot pants, or why you might have decided to pass on that blouse on sale.
Wake up guys. Look, for the average guy yoga can be intimating, no? Most guys initially see yoga as effeminate or girly to begin with. Men need to feel confident going to class, and bring the right equipment, particularly the mat.
Here' some simple guidelines for what I think would be a great mens yoga mat:
Increased Length - At a minimum the mat needs to be Six Feet Long (72 inches / 183 cm)
Extra Thick and Durable (1.4 thick)
Styled right. Guys need a brand that has style, too.
Either way, I think there's definitely a need out there for a good number of guys to have a mens yoga mat available today in the market.