- Siren 4 Thermo Mid Zip WP is a ladies casual winter walking boot by Merrell
- Waterproof leather upper with waterproof, breathable membrane
- Inside zipper for easy on and off
- 200 grams Primaloft Gold Eco Series synthetic insulation
- Solarcore insulation with Aerogel provides underfoot superior warmth while being extremely flexible and ultra-thin
- Vibram Ice Trek outsole designed to provide improved grip on very cold, icy, or snowy surfaces