Another group reached out to me about promoting their yoga mat reviews, and happily I oblige. For your consumption I offer information from Consumers Advocate website.
Their claim is that they review mats based on four major criteria: Functionality, Eco-Friendliness, Value and Design.
They put in over 300 hours, used 90 sources to gather information, and reviewed mats of 11 companies to come up with a comprehensive guide to eco-friendly, non-toxic yoga mats. This is the 2019 list, updated as of August, 29. Please, enjoy!
For more on yoga mats, search blog for "yoga mat reviews."