Made to order! What ever size you want. A bit pricey but I think well worth the money. My cutting table is 7 ft long and I have to butt two mats together sometimes. Joanns and other stores have a mat that is about 59x36 but I need bigger to cover my entire top. And get this, this order to size mat is self healing! You can order one here
http://www.draftingsteals.com/catalo...ting-mats.html
No I'm not affiliated with this company in anyway, just an obsessive surfer of quilting ideas.