Pirelli Webbing

She thought that she may replace it with the cheaper elastic webbing however it does not do the same job for those particular chairs and she would have been disappointed with the result.

Pirelli is a superior type of rubber webbing designed to give maximum support. Even if you put double the elastic webbing of it would not be as supportive.

Pirelli though is extremely taut and you cannot put it on frames that were not built to support it otherwise you may pull the joints apart of the chair.