Car covers are available in 4 breathable and water resistent fabrics, as follows: Durafin Flannel:  100% cotton flannel backed and heavy duty material.  Heavy weight of this fabric makes it a superior fabric for extended indoor or outdoor storage.  Not recommended for machine washing, but can be hosed off and air dried. Sunforger Flannel:  100% cotton flannel backed, preshrunk and machine washable.  Excellent for all seasons indoor and outdoor automobile storage. MATRIX:  3 layer marine grade chemically treated non woven material.  Excellent for spring and summer outdoor and year round indoor storage.  LIghtest weight fabric which makes Matrix suitable for on/off every day car cover.  Fabric is water resistant and breathable. NOAH: 4 layer chemically treated non woven fabric.  The construction of this fabric provides superior paint protection against all dirt, dust, polutants and UV rays.  Light weight, yet durable enough for year round indoor and outdoor storage.