Merrell Siren 4 Thermo Mid Zip Waterproof Women's Walking Boots

Made for crisp mornings, snowy strolls, and everything winter brings, the Siren 4 Thermo Lace Waterproof wraps your feet in cosy warmth with a women's-specific fit designed for all-day comfort.

Waterproof Suede Leather Upper

Utilising a suede leather construction, the Siren 4 Thermo have a comfortable, durable upper with the ability to keep feet comfortable, as well as dry, thanks to the waterproof membrane. The leather upper enhances protection against knocks and bumps, dirt and debris, for long-lasting wear. A Merrell waterproof membrane stops water, rain and damp conditions from penetrating, keeping feet dry and cosy no matter how bad the conditions. A bellows tongue helps to keep out debris, while a protective TPU waterproof shell provides additional protection and helps to protect you against rocks and uneven surfaces. The recycled laces keep feet locked in and secure, preventing in-shoe slippage. 200g of Primaloft Gold Eco Series synthetic insulation provides exceptional warmth when temperatures drop below freezing, while a faux fur lining traps heat, keeping toes toasty and enhancing comfort. Completing the upper is a YKK zip to assist in putting the boots on and off.

FloatPro Foam Midsole

Within the midsole, Merrell's signature FloatPro Foam has been used to ensure a light, durable ride. The midsole provides ample underfoot cushioning to reduce impact on your feet during tough trails while being as lightweight as possible, so you never feel weighed down. The lightweight midsole provides supreme cushioning and support in key areas like the arch and heel, holding your foot securely in place for a smoother transition and wear. By supporting these key areas, the midsole helps prevent discomfort and possible injury. A FloatPro insole completes the midsole, providing supreme underfoot cushioning and energy return for instant step-in comfort.

Vibram Icetrek Outsole

Designed with a technical compound and exceptional overall performance, perfect for outdoor activities, the outsole construction of the Siren 4 Thermo has a Vibram Icetrek outsole. The outsole offers traction and support in all conditions. This construction provides the boots with flexibility for more comfortable stepping. The advanced rubber compound provides greater traction on very cold, icy, or snowy surfaces, even in extreme temperatures, ensuring confident footing no matter where you choose to explore.