Customer Reviews Merrell Siren 4 Thermo Mid Zip Waterproof

The perfect boots for travelling in cold weather. I bought these boots for an upcoming trip to Scotland and these are just what I was looking for. They are warm, waterproof and the best part is that they are lightweight. They are roomy enough so I can wear thick socks with them and they are true to size.

I was very happy when I tested my brand new Merrel boots during a very long hike in the cold and snowy Swiss mountains. The boots are super comfortable with great support for my feet, and they kept my feet warm and dry during the long hike! I highly recommend these boots.

I bought this because I am up in Wisconsin for a couple of months. I had a sorrel boot but after wearing the Merrell, no comparison. They are so comfortable warm and fit so well. Just purchased another in a different color.

Love my boots. Took a snowy walk in the timber north of my house in a wintry storm in South Dakota.

Absolutely love these boots! So warm and so comfortable! I am a dog walker and they are perfect for long days in the rain or snow! Feet stay completely dry!

I wore these new boots all over Austria & Germany during their record snow in December 2023. Temperatures were 16-36F and my feet never got wet or cold. I'm a true size 6 and they fit comfortably with thicker socks. I highly recommend.

Very comfortable and warm!! Fit is as expected and great for walking the trails

Very warm and comfortable. Easy on and off. Keeps my feet dry.

Just took these on a snowy overnight backpacking trip and they kept my feet toasty warm/dry and I had no issues breaking them in. Traction was also surprisingly good in the snow. Only downside is the sizing - I'm a 6.5 or 7 in all other Merrell boots but had to get a 7.5 in these. Glad I tried them on beforehand because the 7 would have been too small. For reference I have average width feet

Took my Merrells to Iceland and they did not disappoint. My feet were warm, dry and comfty during 10 days of adventures....waterfalls, glaciers, & hikes for miles. My husband loves his just as much.

Just got them today and these boots are very comfortable, lightweight and warm. They also look great. I bought them half a size bigger than my usual shoesize in order to be able to wear thick socks and the fit is perfect. They seem durable and well made, I only wish they made a model that would rise to the middle of my calf.

These boots are fantastic! They look stylish, they are comfortable. Just waiting on the snow now! Can't wait to wear them them!

Always buy Merrell for outdoors and work on our alpaca farm. Never have to worry about fit or even breaking them in! Theyre always comfortable and durable!

I packed these for a trip to Finland above the artic circle in winter. Very comfortable, very warm, and very lightweight! Highly recommend!

Very comfortable and warm! I wore them all day while standing and walking and my feet felt great.

Took these babies to Colorado. Kept my feet nice and worn in 20 degree weather!

They are okay not exactly what i thought when looking at the picture online. My feet were warm.

I work inside and outside and needed a boot that could be warm and handle the changing weather as well as comfortable inside. This did the trick.

Purchased these shoes specifically for a winter trip to Iceland. They were amazing! Purchased a half size larger than I normally wear to accomodate thicker socks and it was perfect. My feet stayed warm and dry during many outdoor activites. The boots were comfortable even after wearing for 10+ hours a day. Would highly recommend for any winter outdoor activities.

My daughter purchased a pair of these a year ago and really liked them. This year I bought a pair as well due to her recommendation, and I'm NOT sorry! These boots are FANTASTIC! They were comfortable to wear from day one with no breaking in period, and they are cute as heck to boot (pun intended). YES!! I live in the Pacific NorthWET and the boots have lived up to their waterproof reputation, keeping my feet warm and dry. The sizing is pretty right on as well. Technically, I'm a 6-1/2 - 7 Wide and I purchased a size 7-1/2 to allow for thicker socks, and these are a pretty sweet fit. I'd HIGHLY recommend them.

I ordered these in a size 8. Its as if no one took into account the insulation would take up interior volume. Cant wear winter socks with these boots. Athletic socks still result in a tight fit. Not enough tie length to adjust volume and still tie top portion of boots.

I saw these in a store and they were priced around $200. They didnt have my size but I loved the way they felt on my feet but they were a little too small. When I returned home I looked on the website and found not only my size but a huge discount too. Needless to say I ordered them. They are the most comfortable boot I have ever owned, so much so that I ordered another pair at the same price in black. I love them!!! I went one half size larger and they are perfect! So warm and sturdy.

Out of the 3 I purchased this may be the one I use for everyday wear in the outdoors. It is a pretty boot. The zipper is a nice concept and not sure how it will work overtime as far as duability but it may make taking off and/or putting on the boot easier which is a big PLUS. Alsom, warm, nice sole and I like the two hooks at the top of the laces for really adjust things if needed. The inside of the szipper has a bit of a liner that arises and is likely were the water proof portion stops - not sure how waterproof the zipper is yet.