Elastomer is a term used to describe highly-elastic fibres.
Silicone is a term used to describe silicon-containing polymer materials which have found extensive use in the industry because of their excellent stability. They are available as fluids, sealant-adhesives, moldable resins, and rubbers – First silicone oil made in the 1870s, its insensitivity to both high.
Spandex is the generic name for artificial fibres derived from a resin called segmented polyurethane. It has excellent stretch and recovery properties
Textile Fibre Overview with links