Hats can be categorized by size into fitted hats and adjustable hats. Today, we’ll focus on the types of adjustable hat buckles.

Plastic snapbacks

There are many options for the back buckle in hat design. Some hat styles have classic, fixed back buckles, such as the back buckle of a flat brim cap is definitely a plastic snap.

If you see the text snapbakc on the cap brim, it means the back snaps are plastic. Of course, curved brim caps can also be made with plastic snapbacks. Plastic snapbacks come in single-row and double-row types. Generally, they are fastened with 5 buttons and left 2 open, or 4 buttons and left 3 open.

Klettverschluss

Velcro is widely used in clothing, shoes, backpacks, hats, and other products.

Common Types Of Metal back buckles

Fabric Strap with Metal Buckle

Metal buckle + waist ring

Leather Strap with Metal Buckle

Metal D-ring buckle

Common Types of Plastic Back Buckles

Snap-on

Track buckle

Tipp: Regardless of the type of back buckle used, the exposed portion of the buckle is generally 8.0-8.5 cm, ensure the buckle has a 2-3 cm adjustment range. This adjustable cap size is called one size fits all (OSFA) or One Size Fits Most (OSFM).

Fitted Caps

For standard fitted (closed-back) caps, New Era (NE) size caps are typically available in 10+ different sizes, generally ranging from 54 cm to 64 cm, with the largest size going up to 66 cm.

For the 47 washed style, fitted caps usually come in 4–6 size options, ranging from 54 cm to 62 cm.

Stretch-fitted caps feature elasticity, typically ranging from 3-4cm in size. Therefore, they are usually made in two sizes: S/M and L/XL.

The concepts of front and back are relative. When wearing a baseball cap backwards, the back flap is exposed in front, creating a different style of wearing a hat.