Quick Summary
The Merrell Siren 4 Thermo Mid Zip WP is a women’s mid boot in Tobacco, size UK 5. It is a waterproof boot with a full grain leather and knit upper, a medial YKK zipper, and a waterproof membrane.
The boot also includes 100% recycled fleece lining, 200 grams Primaloft Gold Eco Series synthetic insulation, a SOLARCORE Aerogel insole, a FloatPro Foam midsole and a Vibram Icetrek outsole.
Key Details
| Detail | Verified information and buyer relevance | |
|---|---|---|
| Brand | Merrell – the brand name used for this women’s boot. | |
| Model | Siren 4 Thermo Mid Zip WP – the model name that distinguishes this boot. | |
| Product type | Women’s mid boot with a zip fastening. | |
| Colour | Tobacco – check this matches the colour you want. | |
| Size | UK 5 – confirm the selected size before choosing an offer. | |
| Upper | Full grain leather and knit upper. | |
| Waterproofing | Waterproof membrane and waterproof construction are stated for the boot. | |
| Fastening | YKK medial zipper for easier on and off. | |
| Lining | 100% recycled fleece lining. | |
| Insulation | 200 grams Primaloft Gold Eco Series synthetic insulation. | |
| Insole | SOLARCORE Aerogel insole. | |
| Midsole | FloatPro Foam midsole. | |
| Outsole | Vibram Icetrek outsole. |
What to Compare Before Buying
- Size: This pair is UK 5, so check the size against the fit you need.
- Waterproofing: Waterproof construction is stated, so this is the key point if wet weather matters.
- Warmth features: The lining, insulation and insole are part of the boot’s cold-weather build, so compare those details with your intended conditions.
- Fastening: The medial zipper changes how the boot is put on and taken off, so confirm that style suits you.
- Outsole: The Vibram Icetrek outsole is part of the stated grip setup, so consider the surfaces you expect to wear it on.
Choosing the Correct Version
Check the colour, size and exact model name before you choose an offer. This boot is the Tobacco UK 5 version, and those details matter if you are comparing other Siren 4 Thermo variants.
Before You Decide
Confirm that you want the Siren 4 Thermo Mid Zip WP in Tobacco, UK 5. Check that the waterproof, insulated mid-boot format matches your needs, and make sure the zip fastening and outsole style are right for your use. If you need a different size or colour, choose that variant instead.
