The 58-piece line, which includes gym towels, a water bottle, a volleyball and a yoga mat, is technically advanced. Tank tops have silver threads down the back to draw out heat, and running pants have reinforced panels to alleviate muscle fatigue. Many pieces also have reflective stripes for safety. But McCartney's design signatures are everywhere, including the muted color scheme (dusty rose, graphite, yellow and blue) and the details (laser-cut eyelet, raw edges and ribbon ties). Hoodies are cropped and reversible, sweatshirts are off-the-shoulder, tank tops are long with drawstrings at the bottom, and pants sit low on the waist. "You should be able to wear these clothes to get a pint of beer after going to the gym," the designer said.