Mat okay, but not for heavier desk chairs
Response from americanfloormats.com
Thanks for the message. We carry 5 grades (ie, thicknesses) of clear chair mats for carpeted surfaces (in addition to the other materials, colors, designated surface styles). It seems, based on your description, you may need a thicker mat to help alleviate some of the dimpling you're referring to. Feel free to contact us at your convenience so we can collect all of your order info and find a better solution for you!