Siren 4 Thermo Mid Zip WP Boot Wmns earth management Old school and still cool

Old school and still cool

The whoosh of your buddy passing you through the rock garden is basically just an invitation to chase

Elevated with advanced insulation and material technologies

Dedicated bouldering brush pocket so you can brush holds for your friends and remove tick marks at the end of a session

Siren 4 Thermo Mid Zip WP Boot Wmns earth management Old school and still coolWith 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 200 grams of 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. The all new medial zipper provides easy on off,