Unroll the mat, as flat as you can get it. Then, flip it over and reroll the mat with the fibre outwards. Creating this opposing new curl shape will in effect straighten the curled mat. Keep it rolled up (longer for thicker/less for thinner mats) and check it every so often until the previously upturned (curled) corners are laying flat as desired.

Entry Mats with genuine rubber edging that are part of the molded product help prevent edge curl. PVC Backed and edged products curl more often then rubber backed and edged mats due to the poor memory of PVC. Products like our Entrano Classic Mat and Entrano Rollstock mat are available with a non-curling edge.