Sock, of synthetic fiber, usually bonded to a rubber sole designed to be worn while wading in water at the beach, river or lake. Can be worn as extra foot protection with swimming fins for water enthusiasts.

Waders, called Shorebirds in North America (where "wader" is used to refer to long-legged wading birds such as storks and herons), are members of the order Charadriiformes, excluding the more marine web-footed seabird groups. The latter are the skuas (Stercoraracidae), gulls (Laridae), terns (Sternidae), skimmers (Rhynchopidae), and auks (Alcidae). Also, the pratincoles (Glareolidae) and the Crab Plover (Dromadidae), which look more similar to waders, are closely related to the seabirds.