Flexfit cap is a comprehensive cap that cannot be resized. Instead, the cap has an extensible elastic band around the entire head, which makes the cap form after your head. The Flexfit cap is smooth as it sits firmly on your head.
The Flexfit caps are a more modern version of the classic baseball epic and have become more and more common over the past decade. The thing that makes the Flexfit caps stand out is that they cover the entire head all around, so no opening for size adjustment. Instead, the caps have a stretchable elastic on the inside that allows the cap size to be adjusted to the shape of your head.
This is also usually combined with the fact that the Flexfit caps' other fabric is somewhat extensible, which means that the entire cap fit is adjusted to your head. But in order not to make the cap sit too loose or too tight, it is not uncommon for Flexfit caps to be available in several different size ranges.
That is why the Flexfit cap is right for those who want a full cap with a perfect fit and a nice tight style around your head.