A measure of 1/8 inch (or 3.17mm) is considered the standard thickness of a yoga mat. Most of the yoga mats are typically between 1/8 to 3/16 inches thick (or approx. 3 to 5mm). Yoga mats in 4 to 5mm thickness range give an adequate amount of comfort and enable the most stability, hence perfect for most people.
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PRO™ Yoga Mat 6mm