The self-healing cutting mat that was specially designed for use with rotary cutters. Long-lasting (I had my previous mat for 10 years), you will get many years of cutting from this mat. You do need to look after it i.e. you shouldn’t use hot appliances like irons on it!
This one is double-sided, and it’s best to keep it stored flat. Ideally on top of your cutting table for perfect measuring. You must have a cutting mat to do patchwork and quilting. Take a look at the blog post on quilting tools to see what else I use.