With 25 years of Merrell's women's-specific fit, the Siren 4 Thermo is uniquely engineered to cradle the distinct contours of female feet, providing comfort, support, and stability even on the longest hikes with added insulation for warmth and protection.
- Waterproof membrane seals out water and lets moisture escape
- Waterproof full grain leather and wool upper
- Bungee lace with toggle closure for a secure fit
- 60% recycled laces
- Bellows tongue keeps out debris
- Rubber toe and heel for durability and protection
- 100% recycled fleece lining
- 200 grams Primaloft® Gold Eco Series synthetic insulation
- Rock plate for protection
- FloatPro Foam™ midsole for a lightweight ride that lasts
- Vibram® Icetrek outsole designed to provide the improved grip on very cold, icy, or snowy surfaces