there is air in a football.
Rubber.
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It depends what size the football is and what material it is made from.
it is played both inside and outside. if it is played inside, then they call the stadium a dome. most football fields are outside
stuff It also depends on what type of football you want.
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a gel-like material inside a cell membrane is cytoplasm
The inside cellular material that carries out life functions is the CYTOPLASM(cyto-cell)
the inside of a football
leather
Outer material is cotton and inside is polyester.