A full plastic snap set is composed of three types of pieces: caps, a stud, and a socket. When the snap is in use the socket and stud lock together, while a cap holds each of them in place from the other side of the fabric.

There are three sizes of Patagonia plastic snaps:

Small 14L (0.35 inches, 8.9 mm)

Medium 20L (0.5 inches, 12.7 mm)

Large 24L (0.6 inches, 15.3 mm)