Designed for colder conditions, the Siren 4 Thermo Lace WP delivers warmth, waterproof protection, and a women’s-specific fit. Featuring Primaloft® insulation, faux fur lining, and Vibram® Icetrek traction, it’s built to handle snowy sidewalks and chilly trail days. Lightweight FloatPro™ foam adds lasting comfort without the bulk of traditional winter boots.