These items are called bicep bands. They are made of a variety of materials: some are nylon, some are cotton, some are synthetic blends, etc. Bicep bands are used to catch and absorb sweat on the arms. read more
Players on NFL and college football teams wear bicep bands. Bicep bands range in color and size and can be worn on one or both arms. The bands are made from old socks, swatches of stretchy material or athletic tape. read more
While players nationally wear arm bands at the bicep level, some states, like Texas, restrict armbands to just the wrist area. In addition to bands, officials consider some football attire, like headbands, frivolous and worthy of banning. read more