13 of 16 people found the following review helpful
"Meat tenderizer" for your muscles,
You can think of the TP Grid roller as a "meat tenderizer" for your muscles. This is a great product that can be used to do a number of functions such as massage and myofascial release therapy, stretching, and even vertebral mobilization. Check out Youtube for techniques and other uses.
It can do the same functions as a traditional foam roller, with a nice textured surface that adds another dimension to foam rolling. The design is quite light weight and portable, and uses closed-cell EVA foam (non-porous; anti-bacterial) and reinforced core made of durable (PVC?) plastic. Easy to clean; just wipe surface down with a clean rag with disinfectant. It is also stiff without being very uncomfortable.
The only con is that it only comes in one size. Although 13" makes it portable, I end up using my 36" foam roller more because it is longer and you can lay on it vertically to do some balance exercises and stretching. The short 13" design does not allow for that same usage.