The women’s Merrell Siren 4 Thermo Mid Zip WP snow boots are suitable for intensive use in winter conditions, thanks to a Waterproof membrane and PrimaLoft® Gold insulation that effectively protects against the cold. They feature a Vibram® rubber outsole for stability on slippery surfaces and FloatPro™ Foam for cushioning while walking. The design is completed with laces made from 100% recycled materials, while an additional SOLARCORE® insole enhances thermal comfort in low temperatures.
Basic data
Product details
Outsole
Protection
Warnings and producer's data
Women's snow boots Merrell Siren 4 Thermo Mid Zip WP hazel (J038764)
Women's snow boots Merrell Siren 4 Thermo Mid Zip WP hazel are ideal footwear for women looking for reliable protection on winter adventures. Featuring a high upper, they provide excellent thermal insulation and protection from harsh weather conditions. Made from high-quality materials, these snow boots use Waterproof technology, which guarantees complete waterproofing and protects feet from moisture and snow.
Advanced protection technologies
Women's snow boots Merrell Siren 4 Thermo Mid Zip WP hazel use PrimaLoft® Gold technology, which provides exceptional insulation, even in the most extreme conditions. In addition, SOLARCORE® technology supports thermal protection by retaining heat inside the boot. This allows wearers to enjoy warmth and comfort even in low temperatures.
Comfort and stability
Thanks to the Vibram® outsole, snow boots Merrell Siren 4 Thermo Mid Zip WP hazel deliver excellent grip on slippery surfaces. FloatPro™ Foam provides lightweight cushioning, making them comfortable to wear over extended periods. In addition, the NXT® insole gives the boots antibacterial properties, helping to keep the inside of the footwear fresh.
Eco-friendly
Women's snow boots Merrell Siren 4 Thermo Mid Zip WP hazel are made from recycled materials, highlighting Merrell's commitment to protecting the environment. The laces are 100% recycled, further demonstrating the manufacturer's eco-friendly approach to footwear design. They are an excellent choice for those who value environmentally friendly products.
Women's snow boots Merrell Siren 4 Thermo Mid Zip WP – features:
- Waterproof technology for complete waterproofing;
- Thermal insulation thanks to PrimaLoft® Gold and SOLARCORE®;
- Vibram® outsole for excellent grip on slippery surfaces;
- FloatPro™ Foam for lightweight cushioning;
- NXT® insole with antibacterial properties;
- High upper for better protection from snow;
- Made from recycled materials to protect the environment;
- 100% recycled laces highlighting the eco-friendly approach;
- Boot weight: 1080 g.
Product Details

High upper protecting the foot
The built-up shaft effectively shields the foot from snow and moisture while moving in challenging terrain. Its height limits the exposure to cold elements from the outside, protecting the leg along its entire length in deep snow. When walking through drifts, the user can rely on a barrier that protects the feet from getting soaked even in adverse weather conditions.

Vibram® sole with excellent grip
During a march on snow-covered or icy trails, the Vibram® sole provides secure contact with the ground. The contoured tread effectively supports movement, minimising the risk of uncontrolled slipping on changing winter surfaces. Even with sudden changes in pace or direction, every step maintains predictability and safety.

Waterproof technology and water resistance
The use of Waterproof technology effectively isolates the interior of the shoe from external moisture. This solution blocks the penetration of water and snow while walking on wet or snowy terrain. During long walks in winter conditions, feet remain dry, regardless of the intensity of precipitation or melting snow underfoot.
Comfortable
Bought for my girlfriend – cosy and warm
Merrell shoes
Great shoes wife satisfied
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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Women's snow boots Merrell Siren 4 Thermo Mid Zip WP hazel
Women's snow boots Merrell Siren 4 Thermo Mid Zip WP hazel
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