Lululemon has ruled the activewear market, amassing a passionate fanbase as devoted as it is expansive, with many of its products earning cult-like status. For the uninitiated (or anyone just looking to stock up), we've sussed out the must-have buys that diehard fans swear by. From leggings and workout tanks to loungewear and belt bags, here are the Lululemon buys most worth adding to cart.