Adidas by Stella McCartney teams up with Parley for the Oceans in a series of sustainable activewear that uses recycled materials, such as these black shorts. The high-rise pair is constructed in a double-layer design with the outer detailed in breathable mesh to keep you cool and cycling shorts underneath that stretch with you as you train. Note the contrasting white logo print along the side for a signature finish. For a seamless look at the gym, try them with the label’s workout T-shirt and low-top trainers.