Merrell Women's Siren 4 Thermo Mid Zip Waterproof
With 25 years of Merrell's women's-specific fit, the Siren 4 Thermo is uniquely engineered to cradle the distinct contours of female feet, providing comfort, support, and stability even on the longest hikes with 200 grams of added insulation for warmth and protection.
| US | UK | EU |
| 5 | 2.5 | 35 |
| 5.5 | 3 | 35.5 |
| 6 | 3.5 | 36 |
| 6.5 | 4 | 37 |
| 7 | 4.5 | 37.5 |
| 7.5 | 5 | 38 |
| 8 | 5.5 | 38.5 |
| 8.5 | 6 | 39 |
| 9 | 6.5 | 40 |
| 9.5 | 7 | 40.5 |
| 10 | 7.5 | 41 |
Free shipping on orders over $99 (oversize charges may apply) - Learn More
Fast and easy returns (no returns for final sale or heavily discounted items) - Learn more
Found a better price elsewhere? We guarantee you the best price on this item - Learn more
Premium gear is our promise
We were established almost 75 years ago by John Monod, a Swiss mountain guide and ski instructor. Quality outdoor gear is what our brand was built upon since 1949. Learn more.
Frequently Asked Questions
Have more questions? See all FAQ's
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Absolutely! We offer fast & easy returns on most products.
Exceptions include products 30% off or more, climbing gear, underwear & more.
Read our return policy here.
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All orders over $99 will qualify for free standard shipping within Canada.*
International shipping charges will apply for all non Canadian orders.
Oversize charges apply to larger items.
*See all shipping information here.
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Standard shipping estimates are as follows:
Alberta and British Columbia: 2-4 business days
Saskatchewan and Manitoba: 3 - 4 business days
All other provinces and territories: 5 - 9 business days