First, what do I mean by best? I'm going by my own made-up combination of style, quality and price. Yes, I prefer the clothes to be made in the US and at least not in a sweatshop, but a caveat: I have not researched these companies in depth beyond what their websites promise. All I know is, I own pieces that I LOVE from these brands.
My criteria is that the clothing must still look new, or at least great, after a couple years of regular wear. They also must be comfortable for sweating in and quick to dry, and must look great on my body while running, dancing, jumping frantically in a HIIT class or any other workout I fancy. Bonus points if the company has fantastic customer service too.
1. Teeki: Teeki's pants are made from recycled materials like water bottles, which is genius. They are suuuper soft and have a nice thin wide flat waistband. Great for any workout though I wear them most often for yoga. Ones like these Stars n' Stripes print are perfect for July 4th! Why not make your yoga practice patriotic?
2. Splits59: like Lulu, this price point is steep, but again, super comfy and quality materials mean they look great for years. I love the trendy styles and fit on athletic frames, too. Their tank tops and shirts are especially great and fit well.
3. Senita: My newest find of the group, but also my new fave. Senita is sister-owned which I love, and has FANTASTIC customer-service. They have fun prints, and are all at a really great price point. I'm obsessed with the bras with the cell phone pocket!)
4. Lululemon: They have great customer service as well (though their short return window and final sale policy can be frustrating). As a former lulu employee, I can say that they offer great freebies to the community, like yoga classes, giveaways and fun events. They also support local fitness studios, which is fab. Yes, their stuff is expensive, but it's also worth it; my favorite workout clothes are my lululemon pieces from about 6 years ago, some of which still looks barely worn.
5. Alo Yoga: I found tights like these high-waist airbrush capris and immediately fell in love. They are versatile from the studio to the street (or date night). They are flattering and make anyone's booty look pretty great so if you're looking for yoga tights, these are a win.