From the lululemon site: Feel free and fully in the moment as you flow through your practice in this classic bra with skinny back-strap details. luxtreme® Is sweat-wicking, four-way stretch, and engineered not to shrink features Designed for: Yoga Lycra®: Added Lycra® fibre for shape retention Coverage: Pockets for optional, removable cups Light support: Intended to provide light support for an A/B cup