Since I am quite vertically challenged, I use 5 or 6 layers of interlocking floor mats in front of the cutting table, ironing area and the long quilting frame. DH used those long plastic ties (around the interlocking parts, one or two per side) to keep the layers from slipping around. And I wear my Crocs, too. Between these two, I do not have any pain at all in my knees or back while I cut, iron or quilt. Well worth it!