A ribbon cable is described, including a first insulative layer extending along a length and a width of the cable, and a plurality of spaced apart substantially parallel conductors extending along the length of the cable. The insulative layer has opposing top and bottom major surfaces and defines a plurality of spaced apart cavities extending between the top and bottom major surfaces of the first insulative layer. The top major surface of the first insulative layer is deformed in a plurality of spaced apart substantially parallel regions extending along the length, and arranged along the width, of the cable. Each deformed region has a shape of a groove and includes a deformed portion of at least one cavity in the plurality of cavities. Each conductor is disposed within a corresponding deformed region of the insulative layer.