When doing anything athletic, I swear by Patagonia's capilene underwear, sports bras, and camisoles. This synthetic fabric, called capilene, is incredible at wicking away sweat/moisture to keep your skin dry to reduce uncomfortable chafing. The fabric is also firmly stretchy to fit around all body types. And, the underwear is seamless, another helpful element to reduce chafing and bunching. The underwear comes in a variety of colors and styles (brief, hipster, thong). I own several pairs of the briefs and thongs (and camisoles) and both styles are quite flattering -- so you can look good underneath it all while working out!
For all of you environmentally conscious folks out there, you should feel good knowing that Patagonia recycles their clothing. When you are done w/ any of their synthetic clothing products, you can return them to your nearest Patagonia store and the garment will be fully recycled and used to make future synthetic garments.
The price for a pair of undies is kind of steep for my tastes (that's why Patagonia is often dubbed Patagucci), but the product is MORE than worth the price. I will continue to purchase Patagonia base layer undies and camisoles.
These reviews are the subjective opinions of ChickAdvisor members and not of ChickAdvisor Inc.