Merrell womens Siren 4 Thermo Mid Zip Waterproof

Merrell womens Siren 4 Thermo Mid Zip Waterproof

(4.5)
189 Reviews

#commissionsearned

Specifications

  • Origin: Imported
  • Sole material: Rubber
  • Shaft circumference: 10-12 inches
  • Inner material: Fleece

The Merrell women's Siren 4 Thermo Mid Zip Waterproof boot is designed for those who love to hit rugged trails and need reliable footwear during cold weather adventures. With over 25 years of experience in creating women's-specific fits, Merrell has engineered the Siren 4 Thermo to cradle the unique contours of female feet. This boot provides exceptional comfort, support, and stability, ensuring you can tackle even the longest hikes. A key feature is its 200 grams of added insulation, delivering warmth and protection when you need it most.

Equipped with innovative SOLARCORE® insulation, originally developed for NASA, you can trust that your feet will stay warm without sacrificing weight or mobility. The boot also emphasizes sustainability, incorporating 100% recycled materials throughout its construction.

Features

  • Women's-specific fit tailored for comfort and support.
  • 200 grams of insulation for enhanced warmth.
  • SOLARCORE® insulation for superior thermal performance.
  • 100% recycled fleece lining for eco-friendly comfort.
  • 100% recycled laces and webbing for durability.
  • 100% recycled mesh footbed cover and removable PU footbed.

Pros

  • Excellent insulation keeps feet warm in cold conditions.
  • Women-specific design enhances comfort during extended wear.
  • Eco-friendly materials appeal to environmentally conscious consumers.
  • Durable rubber sole provides good traction on various terrains.
  • Mid-zip design offers easy entry and exit from the boot.

Cons

  • Some users may find the boot runs a bit narrow.
  • Higher price point compared to similar boots in the market.
  • The insulation may be too warm for mild climates.

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What Customers Say

L
5 / 5

Best boots I've owned

These are exceptional. True fit, great walking comfort and warm feet! They are not high, so I need other boots for deep snow, but for every day use, I couldn't be more pleased.

✔ Verified Purchase
S
5 / 5

Easy on/off comfort!

I LOVE these boots. They don't keep my feet super warm, but they are comfortable to wear indoors at my day job. I didn't realize there was a zipper on the side - it makes them SO easy to slip on and off around the house for outdoor tasks.

✔ Verified Purchase
A
5 / 5

High quality

Super high quality

✔ Verified Purchase
C
4 / 5

Great winter boots

For those wondering about what size to order, this is the best I can tell from other reviews and my own experience: if you have narrow feet, order your usual size. If your feet are wider, maybe order a size up. My feet and ankles are narrow, and my regular size fit perfectly. I hope this helps.Also, if you want to return these, you must do so to Slovakia. They will pay for your return postage up to $20. I thought of returning them, but it would have cost me $75.

✔ Verified Purchase
L
5 / 5

Go 1/2 to 1 size up

I normally wear a 6.5-7 but purchased 7.5 and they fit perfectly. They did not have wide widths so I got 7.5M. I have a wide foot and high instep so shoes are a challenge. These are extremely warm and would only work in cold seasons. I wear soft thin wool socks under them in Alaska. Great for hiking and seem pretty water resistant, sturdy ankle support and built to hold up in wet weather conditions. These are not rubber boots so don't expect a miracle if you step in the lake.

✔ Verified Purchase
A
5 / 5

No break in period, so comfy but do size up!

Love that this came with zippers - that was a huge selling point. I found it easy to zip down/up. Bought it for a winter trip to Japan. I spent a really long time looking at reviews on sizing all over the web since our local Merrell doesn't have a winter line (I live in a tropical country) so I have no choice but to rely on reviews. I bought this specifically to hike in so I needed a slightly bigger fit to accommodate feet swelling for days of hiking. If you are doing the same, I highly recommend to size up. Based on Merrell size chart, I am a US size 7.5 women's regular, I went up to a size US 9 and with 1 thick wool socks and a change in insole (slightly thicker and bouncier), it fit perfectly with room for toes to wiggle. exactly what I need. It will really depend on your needs but if you intend to add 1 layer of thick socks, you need to size up AT LEAST 1 size bigger. If you will use just thin-medium thickness for socks and for just simple walks, at least half size bigger. Merrell hiking shoes that are at least mid-cut and higher, with insulation and padding really runs small. I will only recommend to go true to size if you have really narrow feet and don't intend to use it with winter socks. But then, this is a winter hiking boot so it is given to size up!It's so comfy too. No break in period at all.

✔ Verified Purchase
L
3 / 5

Disappointed

First let me say I love Merrell shoes and boots. These boots are good looking and comfortable. The Vibram sole is slip resistant. They are warm, however. On a walk on a 30-degree day, they were great. Working to scrape an inch of snow off my driveway on a 30-degree day, not so much. My feet were freezing (even with wool socks). I need a pair of boots for walking in the winter, but these didn't work out for me in cold, wet conditions. Definitely not as warm and comfortable as my 15-year-old Merrell snow boots.

✔ Verified Purchase