The Adir Cutting Mats are the most flexible cutting mats on the market today because they re made of a new 3-ply high-tech polymer material. Constructed with a self-healing surface Adir Cutting Mats are extremely durable and hold up under repeated use with art and mat knives or rotary cutters. Our self-healing cutting mats are 3 mm thick and made of 3 plies. The outer plies are .75 mm thick and give the mat self-healing properties. The inner core is 1.5 mm thick and prevents mat cut-through and extends blade life.