A $125 super-hip yoga mat. A $110 Stella McCartney mat carrier. Nike yoga shoes?

Yoga bling is getting more sophisticated by the day. Which is funny, since yoga requires almost no gear at all.

In yoga, the concept of ahimsa instructs us to “do no harm”—not to ourselves, not to others, and not to the planet. Last Wednesday, Lime.com reviewed several yoga mats that take kindness to our environment seriously, either through nontoxic manufacturing, sustainable and biodegradable materials, or both. Today, we look at the yoga mat's popular companion—the block, in search of the same eco-friendliness.