Enter Girlfriend Collective. This activewear brand is known for its buttery-smooth leggings (high-rise and mid-rise), sports bras, and shorts, all made from recycled plastic water bottles. (One pair of compressive high-rise leggings, for example, keeps 25 water bottles out of the landfill.) The company’s ethically made fabrics—along with its efforts to champion (and fund) diversity and community—have elevated the four-year-old brand into cult-favorite status.