Merrell Siren 4 Thermo Mid Zip Waterproof Hiking Boot - Women's training Designed for mountaineering

Designed for mountaineering

Rib-knit fabric stretches comfortably with movement and recovers its shape through repeated wear

No animal products in the TerraFlex

Long sleeve unisex cut

Merino's natural odor resistance means these hold up through long days without turning on you

Merrell Siren 4 Thermo Mid Zip Waterproof Hiking Boot - Women's training Designed for mountaineeringBuilt for cold weather trail days and winter approaches, the Siren 4 Thermo Mid Zip WP is our pick for women who need real warmth without bulk. Solarcore Aerogel insole technology blocks cold from the ground up, while 200g synthetic insulation keeps feet warm on the move. The Vibram Icetrek outsole handles ice and packed snow where standard lug patterns give out. Vibram Icetrek outsole bites into ice and slick winter terrain where standard rubber