THIS IS A VERY GOOD PRODUCT. I BOUGHT 2 BECAUSE IN THE PAST WHEN I BOUGHT WAIST TRIMMERS FROM OTHER MANUFACTURERS, I WAS USD TO THEM WEARING OUT OR ROLLLING OVER AFTER A MONTHS USE. THIS PRODUCT IS ON A WHOLE OTHER LEVEL OF DURABILITY. IT IS THICK BUT NOT TO THICK WHERE IT WILL SHOWM THROUGH YOUR CLOTHES, BUT YOU FEEL THE FIRM SUPPORT OR HEAT DEPENDDING ON HOW YOU YOU USE IT . I USE MINES TO WORK OUT FOR WAIST TRIMMING AND HEAT COMPRESSION AND ALSO AS A BACK SUPPORT. THEY ALSO CAN COME CUSTOMIED IF YOU SPEAK TO THE SELLER.. VERY VERY GOOD!!!One of the best constructed I have ever owned, and it's finally big enough for us bigger people. The Velcro attachment is fantastic, my only knock on this is I wish they would tapper it more at the Velcro end.I am always bent under a car or truck hood and I get a sore back after a while. I find that this product keeps my lower back warm and back muscles lest stress.