437 The Essentials Legging in Lavender 82% recycled polyester 18% spandex. Hand wash. Pull-on styling. Lightweight activewear fabric. 437F-WP29. ACBO1274. About the designer: 437 is a Toronto-based activewear brand founded by Hyla Nayeri and Adrien Bettio and run by an all-women team. Color: purple