These mats are great, and necessary. Just the right thickness (0.47 inch/12 mm -- read the specifications before purchasing; I've seen some complaints on other mat reviews that they were too thin). To me, these do a good job to relieve standing aches but not so much that they feel unstable. Pretty, too. I chose blue and got both the 1'5"x2'8" and 1'5" x 5'