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
• Protective shell keeps feet dry
• Waterproof suede leather upper
• 100% recycled laces and webbing
• Bellows tongue keeps out debris
• 100% recycled fleece lining
• 100 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
• Drop: 8mm
• Lug: 5mm