Well built, but arch is too low to be effective
Maybe this will work for tiny people.  I am 5' 7" and this is not effective on my back.  It is too low to the ground and 2 more inches would have been great.  This is lower than most rollers for back.  I thought this would help my back with the gradual, extended curve, but it was not effective.  It is a bit pricey for a foam product for $21.  In all fairness, it is a good quality hard foam arch, but too flat to the ground to be effective.
Rating: 3 stars