Customer Reviews Merrell Siren 4 Thermo Mid Zip Waterproof

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.

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, light, warm enough for winter time, and look great. I wear them for hiking and walking. I love them!

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

I wore these in the CO chilly, slick weather today, just walking at the park nearby. The pros: They were plenty warm (not overly warm, but just right), and roomy in the toe box, and the tread worked very well on somewhat slippery terrain. Cons: The fit inside the boot is not overly soft/plush, or super comfortable. I'm going to try my inserts and I'm hopeful that will improve the feel. The other noteworthy thing is that on this first walk, the left boot's tongue was painful on the front of my ankle. I will try to move it around because the right one was just fine. I gave them a 3/5 because of the comfort factor (nothing extra to provide comfort/cush on the inside), and the tongue issue. They may end up working out well, and I hope that will be the case!

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

I just got it now. And im so happy to my purchase. I haven't tried it yet but it looks like so comfy.

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!

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.

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.

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.

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.

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!

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 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!