The thickness of yoga mats is mainly 3 mm, 4 mm, 5 mm, 6 mm and 7 mm, and 20mm should not be available at present. And that thickness is not conducive to training.
Generally speaking, PVC foam floor mats can only be 6 or 7 mm, and TPE cushions can reach 10 mm, which is very soft.
Beginners can use a thicker yoga mat, such as 6, 7 or 8 mm thick, to prevent sports injuries.
With a certain foundation and experience, you can switch to a yoga mat with a thickness of 3.5 mm to 5 mm Of course, if you are very afraid of pain, you can always choose a thicker yoga mat to practice.