Merrell Siren 4 Thermo Mid Women's Boot

The Merrell Siren 4 Thermo Mid is built for women who hike year-round and refuse to let cold weather cut the season short. This insulated mid-height boot combines proven trail performance with 200g of synthetic insulation, keeping your feet warm without the bulk.

Key Features:

• 200g M Select WARM insulation for reliable cold-weather warmth
• Waterproof construction keeps feet dry in snow, slush, and wet conditions
• Vibram Arctic Grip outsole delivers confident traction on wet ice and frozen trails
• Side zipper for easy on/off—especially convenient with thick socks or cold hands
• Kinetic Fit ADVANCED removable contoured insole provides flexible support
• Mid-height design offers ankle stability on uneven terrain
• Bellows tongue keeps debris out

Whether you're breaking trail on a frosty morning or navigating icy parking lots after a winter storm, the Siren 4 Thermo Mid delivers the grip, warmth, and protection you need. The boot's proven Siren platform has been trusted by hikers for years, and this insulated version extends that reliability into the coldest months.

Pair with merino wool socks for all-day comfort on winter day hikes and shoulder-season adventures.