I got this when it was starting to get cold in my area. The day I got it, I was called out at 10pm for a call that was up in the mountains, and it was already below freezing. I didn’t get off the call till 11 am the next day. I stayed warm the whole time and didn’t need extra layers that would have covered up my BWC or my other gear.

I’ll say the same thing I said about the base layer pant I purchased. If you have to spend time out in the elements, this base layer shirt will do a great job of keeping you warm. I purchased the set as a base layer for winter motorcycle riding, and they are a little too bulky for that purpose. I eventually got all the gear on, but it was a little tense, hot and tedious. But, again, for general outdoor use exposed to extreme cold, the set is excellent equipment.

I am very impressed with my shirt. It's very warm, resist water, and is quiet. I will use it for deer hunting.

Got this piece of clothing to give it a shot in the cold canadian weather.

Tested this with a slim winter jacket in -20 degrees Celsius with 60km winds. It honestly performed better than I expected. I felt pretty warm.

For the Canadians out there, I would be using this more as a heavy duty thermal layer. It fits pretty well under your issued jacket and adds great insulation. The shirt also has some wind resistant properties too so it pairs nicely with a winter coat.

I also tested this in -15 weather with only the shirt and a hoodie on top, went out for a long walk and didn't feel cold at all. It definitely does a good job of trapping in the heat.

In terms of how comfortable it is, I would say it's a 8/10. As expected though based on how it's made and what it is designed for. The material makes the shirt feel a little "Stiff" if you will. Like it's not form fitting, but it's not uncomfortable either. If you wear a thermal layer underneath this shirt, then it's pretty uncomfortable and you'll find it a little hard to move around. You may get around wearing a tight t-shirt underneath but I find it works best as a base layer itself with nothing underneath.

Overall, definitely a good shirt. I give it a 4.5/5 from a canadian cop's point of view.

I've been wearing the Equinoxx K2 Dyna-Thermal at my part time job, an NFL stadium in the Northeast, where I am outside on the field or in unheated spaces for 11 hours at a time. This shirt is far superior to the three layers I wore under my uniform jacket. That means I'm still comfortable and less fatigued at the end of the day.

I received my top and am very pleased with it, the temperature where I live has been in the mid to low 20's with the wind chill in the single digits, I put the top on it fit perfect , I put a light camo long sleeve shirt on over it and went outside and wore it to a trip to the store and was comfortable the whole time I was outside in the open, without the long sleeve shirt on I could feel the air blowing through the lighter material on the sides that is there for ventilation to keep you more comfortable with heavier activity, I give it 5 stars!

I've worn the Equinoxx k2 for two work weeks and through the two weeks I've worked, the temperature has fluctuated from 18 degrees to 52 degrees in any given day. I wear it under my long sleeve patrol shirt and my external carrier. Through the fluctuating temps and writing reports in the office, I have not felt overly warm or cold at any given moment. This shirt is the perfect solution to working in the winter.

If you live in or operate in cold temperatures, this base layer is a MUST-HAVE! It's unquestionably the best base layer I've ever worn. The cuffs are a really cool and unique design that are snug so the sleeves won't ride up your arms. You won't regret this purchase.

I bought this for my husband who works in law enforcement. He absolutely loves it and raves about how warm it keeps him. He recently bought the pants because he liked this top so much.

Now that the cold weather has settled into NYC
And I have about had it with wearing layers of clothes to keep warm while maneuver
around the city
The Equinoxx K2 dyna thermal works best for me my movements are more flexible and my body is warmer in the 20 degree weather need to get another one in a different color

I gave these as gifts to my daughter & son-in-law and they were THRILLED!!

My new favorite shirt! Wore it skiing the other day and did not have to layer as much!! Definitely a chore to take on and off. Hopefully that will become easier. I wear an XL but feels tighter.

1star not true to size I’m xl and the xl was to small

Wore it steelhead fishing in Western NY,kept me warm and dry for four days,a little hard to take off and put on but the Pros far outweigh the cons,good product.

Initially, I was a little concerned about how tight and form-fitting the K2 was. I ordered Medium, but it felt like a small. Called the company to request how to exchange the shirt for a Large instead, but there was no one who answered, so I had to leave a voice message. The next day, I received a call back. The person assured me that it is supposed to fit tighter and that my 5-8, 170 lbs size was a Medium fit. The first time I put the shirt on it felt too tight, but I went outside in 26 degree weather with only a long sleeve polyester base layer underneath and felt warm and comfortable—-no jacket needed. But getting the shirt off was a a little bit of a chore. It felt like I was in a wrestling match with a shirt, lol! I’m going to give it a chance and wear it more. It will take some getting used to, I think. If you’re some who likes a looser fit, then order a size larger than your normal size. I’ll go with the tighter fit and see if it works. I’ll reserve my final rating/review for later.

Location: Sherman Tx. Weather: 27F with wind speeds of 23mph. I have on a polyester base layer, the EQUINOXX K2, and quilted carhartt overalls. That is it! I don’t feel the wind at all in my arms or torso! Other than my face and hands being cold, (I haven’t tried 221B head and gloves), I am perfectly fine in this weather! I work construction 10 hours outside in the elements and the EQUINOXX K2 has been the GOAT to keep me warm! No more bulky jackets!

I’m a LEO and this shirt keeps me warm. Other people complain about how cold it is, but I feel just fine. It’s not bulky and it fits perfectly under my uniform shirt. This shirt has eliminated the need of wearing multiple layers . I personally find the shirt hard to put on and take off even though I got a size bigger. Nonetheless I’m happy with my purchase, definitely worth the money.

I played golf this past Saturday with my new K2 Thermal in chilly, brisk weather. It was in the low 40’s with wind gusts up to 15 mph. I was warm comfortable and loose for the entire round. The shirt let me be as flexible as I needed and I had no problem swinging my clubs the way I always do. No swing inhibitions at all! It kind of surprised me because even light jackets restrict me somewhat. The shirt also looks good. Usually I don’t like to play past October. But now this shirt will extend my golf season indefinitely, as long as there’s no snow on the ground. I’ll find another outdoor use for my K2 when that happens, such as jogging or going on walks.

Finally got to try this shirt out. Right out of the package I could tell the quality. I wore it under just a polo shirt and let’s just say I was able to stand outside in 20 degree weather without any issue. I did not feel the cold or wind. I am looking forward to being able to wear this during the cold winter months without worrying about getting cold or wet! Only thing I would change is the collar. I prefer a short collar or no collar but I understand the purpose of it. It’s more of a personal preference

Comfortable, and adds a level of comfort in the cold. I get cold easy so I couldn’t use this alone. But I used it as a second layer to my light weight jacket and it’s perfect. I don’t have to wear several layers like I typically did in the past.

I have several thermals from 221B Tactical. They are great in the winter under my body armor. I ordered the K2 thermal for the really cold days. Order a size bigger than what you need. The arm holes are a little small. I used to be a XXL, but the sizing has gotten smaller over the years. I went from a XXL to a XXXL. I'm 6' ft 230lbs with a 50" chest and 36" waist. If that helps anyone.