Women's Merrell Siren 4 Thermo Mid Zip WP Snow Boots provide exceptional warmth and protection during winter days. Thanks to Primaloft® Gold Eco insulation and the Solarcore® Aerogel insole, feet are effectively protected from the cold. The waterproof leather upper and Vibram® Icetrek sole ensure stability and comfort on snowy and icy surfaces.
Basic data
Product details
Outsole
Protection
Warnings and producer's data
Merrell Siren 4 Thermo Mid Zip WP women's snow boots charcoal (J038208)
Merrell Siren 4 Thermo Mid Zip WP charcoal women's snow boots are technically advanced winter footwear that combines innovative technologies with an eco-friendly approach to production. Thanks to the use of recycled materials, including 100% recycled laces, these snow boots provide users with wearing comfort while respecting the environment. The insulation used in the model effectively protects against the cold, making them an ideal choice for frosty days.
Sole and Reinforcements
The Merrell Siren 4 Thermo Mid Zip WP charcoal snow boots are equipped with a Vibram® IceTrek outsole, which guarantees excellent grip on slippery surfaces. Additionally, a partial rand reinforces the shoe's construction, increasing its durability and protection against mechanical damage. The midsole made of FloatPro™ Foam provides exceptional wearing comfort and cushioning, which is especially important during long walks.
Technologies and Waterproofing
The Merrell Siren 4 Thermo Mid Zip WP charcoal model utilizes a range of advanced technologies such as Waterproof, PrimaLoft® Gold, FloatPro™ Foam, NXT®, YKK®, Vibram®, and SOLARCORE®. Thanks to this, the boots are not only waterproof but also exceptionally warm and comfortable. The Waterproof technology provides protection against moisture, while PrimaLoft® Gold guarantees excellent thermal insulation, even in harsh weather conditions.
Insole and Closure
The polyurethane insole ensures thermal comfort and foot comfort by adapting to its shape. The snow boots feature practical lace-up closure and a YKK zipper, making them easy to put on and take off. The high shaft additionally protects against snow and cold, providing thermal comfort in all conditions.
Weight and Compatibility
Weighing 1080 grams, the snow boots are relatively lightweight, which increases wearing comfort. Their advanced technologies and solid construction make them an excellent choice for winter hikes and everyday use.
Product Details

Vibram® IceTrek sole
The specially designed Vibram® IceTrek sole effectively supports every step on icy and snowy trails. The optimised tread pattern minimises the risk of slipping during dynamic movements in winter terrain. Even with a sudden change of direction or a steep ascent, the user can count on a secure footing beneath their feet.

YKK castle facilitating installation
Opening and closing the shoes is efficient thanks to the presence of a YKK zipper, which significantly speeds up preparation for going out. This mechanism allows for quick slipping of the foot in and easy adjustment of the footwear to the user's current needs. In situations where winter weather demands immediate response, the quick putting on of snow boots provides a real advantage during daily outdoor activities.

Reinforcing ring structure
The reinforced edge encompasses selected sections of the upper, creating an additional barrier in areas exposed to contact with sharp edges or rough surfaces. The application of such a solution increases the level of protection against typical hazards during intensive use in the field. When traversing snowy trails, the user gains confidence that the shoe will maintain its properties even after hours of exposure to difficult conditions.
Excellent
Very comfortable and warm. They proved themselves in the mountains and on forest paths. Ideal for cold weather.
Super
Super shoes for winter. Warm and comfortable. They have proven themselves on forest paths, in the mountains and on asphalt.
Convenience
The boots are very comfortable, warm, the zipper makes them easy to put on. Ideal for winter.
Slider problem
The shoes are made of very good quality materials. Soft, light and comfortable. But I tried on 5 pairs and each had a problem with a badly sewn zipper.
Super
Shoes as expected, well sized according to the manufacturer's table, super light and comfortable.
Revelation
My first snow boots and my first encounter with Merrell. A shot in the arm. The boots are great. Comfortable, warm, zipper makes them easy to put on. They didn't get wet in the snow. Warm feeling from the sole when walking. Technically a revelation and visually very nice.
Great
Perfect comfortable shoes. I ordered a size 1/2 size larger and they fit well.
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Merrell Siren 4 Thermo Mid Zip WP women's snow boots charcoal
Merrell Siren 4 Thermo Mid Zip WP women's snow boots charcoal
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