Custom mats for frames aren't always needed, but they're always worth serious consideration.
Bainbridge Alpha Essentials White 8 Ply Mat Board
This one makes a statement of boldness and substance. This smooth, bright white 8-ply mat has a continuous color core. Features Bainbridge’s patented Artcare™ technology, which helps this mat protect art from pollutants. Its fiber meets the most stringent standards for stability and permanence.