Caps use several closure and adjustment styles across listings: back tuck-and-slide closures, back snap closures, pull-on styles, snapback closures, and adjustable straps.
Most listings use adult sizing or "one size fits most." Listed head measurements include about 54–60 cm (21.2–23.6 in) on some items and about 58–61 cm on others.
Most caps list a brim around 2.8 inches (examples as small as ~2.75 in), though one trucker-style listing shows a larger 5-inch brim.
Crown heights vary by style: common values include about 3.9 inches and about 4.3–4.7 inches, while one trucker-style listing shows a taller 6-inch crown.
Some caps use breathable cotton construction and mesh back panels. One trucker-style hat specifically lists a breathable mesh back plus a moisture-wicking sweatband for airflow and sweat control.
