The decision to choose between a curve bill baseball caps and modern trending straight-bill baseball hats often includes a manufacturer's sticker and comes down mainly to your preference. A traditional, yet still fresh-looking curved brim is ideal if you're looking for a team hat. The flat bill cap has been a popular type of trending headgear in the recent decade. It's typically seen on people in their 20s and 30s, and you can find them all over Major League baseball fields today!