What is the most durable flat paper you offer?

If you want something durable then we suggest a 350gsm or 450gsm Silk with a matt lamination both sides - https://www.stressfreeprint.co.uk/shop/other-products/menus/table-menus/table-menus.html 
 
Alternatively we have a polymer menu https://www.stressfreeprint.co.uk/shop/other-products/menus/plastic-menus/plastic-menus.html. This can't be torn, can be washed and can even be cleaned with bleach.