Ah, the yoga mat: It’s arguably the only piece of equipment you really need to practice, and it can make or break a class. Start sliding all over a too-slick surface and there goes your alignment; try to hold Low Lunge on a too-thin mat and bam: knee pain. Yet with so many options when it comes to materials, designs, and price, it can be tough to single out The One. That’s why we tested the new crop—so you don’t have to. Use our guide to find your mat match, and in honor of September's National Yoga Month, enter now to win one of our favorites.