Use a mat that's too thin and it'll kill your knees. Too thick and you'll be off-balance in poses like warrior three. This five-millimeter Gaiam Mat ($30) is the ideal compromise. The rubber is cushy enough that your spine won't rub against the floor during core work, and the sticky surface gives you extra grip.
Prana Flex Short
Photo: Courtesy of Prana
Prana's Flex shorts ($59) are lightweight, water-resistant, sun protective, and made with recycled materials. More important, they're just as comfortable on the bike ride home as they are in your vinyasa class.
Lululemon Dense Foam Block
Photo: Courtesy of lululemon
Sigg Traveler White Bottle
Photo: Courtesy of sigg
If you're thinking of taking up Bikram, you'll need a water bottle like Sigg's Traveler White ($23) to make it through class alive. This 0.6-liter version is lightweight and durable, and has a BPA-free lining that won't give your water that weird plastic aftertaste.