The next generation of Boris caps are here! We've designed the Boris Flex to be cooler in the warmer months, and help you get an even more comfortable fit. This flex-fit version is unlined so the air can flow through the bamboo material. It's also made with a flex-fit sweatband that stretches to fit. Other than that, it's the same great cap! This shape is extremely flattering and easy to wear. It's also a great value, since you can wear this cap however you like. Flip it backwards for one look, frontwards for another! The bamboo plant grows quickly and therefore replenishes itself easily, and makes a soft and durable material. Now we think that's smart! Go 'green' with hats.com!