The Yoga Essentials sticky yoga mat scored the worst on the "green factor" because it was produced using toxic chemicals called phthalates, which are often used to soften hard plastics. However, this mat scored the best in terms of price and durability.

The Envirofit Jute yoga mat scored the worst on durability, and online reviews say that it can fall apart after only a dozen or so uses. However, this mat scored the best in terms of the "green factor" because jute is an eco-friendly, sustainable material.

The Natural Rubber sticky yoga mat did not score the best on anything. However, it was the most consistent all-around performer and is a great value for the money. The rubber yoga mat does contain latex, however, so it is not a good option for those who are allergic to this material.

The Premium Benefit yoga mat did not score the worst on anything, and was twice as thick as all of the other mats. Additionally, it scored the best on health issues - and you can't put a price on the use of latex-free, phthalate-free materials, especially if you are allergic to latex. I have one of these mats at home and it is durable, comfortable, and best of all doesn't smell like a chemical factory when I leave it in the trunk on a hot day. For these reasons it won the editor's pick.