THIS THING IS AMAZING. I USE THIS WHEN AT WORK, CAUSE I LIFT HEAVY THINGS AND ALL SORTS OF OTHER THINGS. NO MORE STRAIN ON MY BACK FOR THE MOST PART. MY DOCTOR REQUIRED ME TO HAVE ONE AND THERE WAS SO MANY TO CHOOSE FROM SO I JUST PICKED ONE AND IT WORKS AMAZING. I WILL BE BUYING A FEW MORE, BECAUSE IN MY WORKFORCE, THESE WILL WEAROUT OR GET HOLES IN THEM.