Large Contour Mat | Clear .145 Vinyl Thick Standrad Chair Mat | Black .145 Inch Vinyl They also need to equal

They also need to equal the measurement entered into Side A

They also need to equal the measurement entered into Side B

Make sure sides A & B are not larger than the material's sheet size

you have the potential for a serious problem

The Breathe Through Option

Large Contour Mat | Clear .145 Vinyl Thick Standrad Chair Mat | Black .145 Inch Vinyl They also need to equalThe Breathe Through Option Chair mats create a great surface to roll on, but when a chair mat is placed on a carpeted area, where the concrete under the carpet was not properly sealed or has no moisture barrier, you have the potential for a serious problem. This problem also arises when the air conditions are very humid. The moisture under the mat is trapped, it has no way to escape so it sits under the chair mat until mold starts to grow. The carpet