Left Continue shopping
Your Order

You have no items in your cart

Merrell Women's Siren 4 Thermo Chelsea


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. Now equipped with SOLARCORE® insulation, lightweight insulation material initially designed for NASA, you never have to worry about warmth. Merrell waterproofing on the upper will keep your feet dry. With Vibram® IceTrek® underfoot, traction remains consistent under the wettest, most slippery conditions. For the first time ever incorporating Vibram® traction lug for enhanced grip on uneven terrain.

• Waterproof membrane seals out water and lets moisture escape
• Waterproof full grain leather and knit upper
• Protective and abrasion resistant rubber heel and toe cap
• 100% recycled pull tab webbing
• 100% recycled fleece lining
• 100 grams Primaloft® Gold Eco Series synthetic insulation
• SOLARCORE® insulation with Aerogel provides underfoot superior warmth while being extremely flexible and ultra-thin
• 100% recycled mesh footbed cover
• NXT treated to prevent odor
• 5% recycled PU removable footbed
• FloatPro™ Foam midsole for lightweight comfort that lasts
• Vibram® Icetrek outsole designed to provide the improved grip on very cold, icy, or snowy surfaces
• Stack Height: 28.5-20.5mm
• Drop: 8mm
• Lug: 5mm
• 0lbs-14.45oz, 410g