According to a recent study by Yoga Journal, nearly 16 million Americans practice the spiritual-physical art of yoga. That explains all the yoga mats competing for your dollars and why you may need a little help selecting the right one. A good mat adheres to the floor and doesn’t become very slick when you perspire. For most people, from beginners to those who have practiced for years, a basic ¼” sticky mat for $16 (also available in 1/8” thickness) is sufficient, though it may take some breaking in to reduce slipperiness. (Wash with mild soap or mist with a 2-to-1 vinegar-water solution.) Made of latex-free PVC foam, these can last for years. Barefoot Yoga, distributor of the top-rated rubber and jute original eco yoga mat ($67, pictured), has several other earth-friendly mats to choose from. There’s the PER mat ($21, made of Polymer Environmental Resin), which doesn’t contain phthalates or heavy metals, and Earth Elements’ TPE mat, which is $40 and is latex, PVC and rubber-free. The natural jute and PER mat ($40) is similar in texture to the Prana mat ($44). Both are decomposable in a landfill and provide a grippy, cushiony texture. Manduka is another highly praised maker of eco-friendly (but pricy) mats, and I enjoy my Jade Harmony natural rubber yoga mat (from $40 to $76), which is biodegradable and PVC-free. Warning: Don’t leave these mats in the car, as the sun will take a toll on them.