Sil-Mesh is a stretchy open mesh fabric ideal for reinforcing silicone mouldings, while still allowing a good degree of stretch and flexibility. It is approx. 150mm wide, and available in a 1mtr length strip, or roll of 100mtrs.
Do not use any other form of fabric reinforcement, e.g Jute Scrim, with silicone, you'll lose the flexibility almost totally!