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.

FEATURES
• 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
• Protective and abrasion resistant rubber heel and toe cap
• 100% recycled fleece lining
• 200 grams Primaloft® Gold Eco Series synthetic insulation
• Rock plate for protection
• FloatPro™ Foam midsole for lightweight comfort that lasts
• Vibram® Icetrek outsole designed to provide the improved grip on very cold, icy, or snowy surfaces