Men’s Fitness ... trail running shoes, sweat-wicking performance tees, warm joggers, and a cozy zippered hoodie. If that's not quite warm enough, it's worth adding a vest, and right now ...

On a recent walk in Los Angeles, Jennifer Lopez layered several winter basics—a cropped puffer vest, a cashmere scarf, gray sweatpants, and combat boots—into a snowflake monochrome outfit.