Customer Reviews Under Armour Base 4.0 Crew

This product is awesome. I wasn't expecting it to keep me as warm as it did. It's thicker than most of my so called cold weather gear. It fits tight but doesn't bother my skin like the others.

I have older pairs of these that had a square grid pattern that were wicked warm. The ones I have are covered in holes from a lot of use but at some point they changed these and they are not nearly as warm or thick as the old 4.0. Please bring back that old square grid, they weee so warm.

I use these as next to skin layer, wool as next layer and cotton FR hoodie as top layer and Im warm down to neg 20 with 0 18 mph wind, no coat. Hard use in ND oil fields and these are still going strong. I own at least 10 pairs of the 4 0. Every good hand I know owns a set of the 4 0. Australian minus 55 Meranio wool is irreplaceable, but combined with 4 0, is a cold weather life hack. Size runs small, normally wear L but with 4 0 I use XL

I have and own several brands of long johns as I am often outside for work and hunting. I reluctantly bought the 4.0 top and bottom to see if the reviews were for real. Well, it does, so I now own 2 sets!

Havent worn yet to give a good review but just from the feel and comfort of trying on it feels like itll be everything its supposed to be

Amazingly warm! Best thing for cold winter days hunting

Must have for a base layer in winter!!

Fits true to size. Would recommend to my friends

Use these for the cold winters in the North Dakotas working on drilling rigs, kept me from freezing my buttocks off. Course nothing will keep you too toasty when it starts hitting the negative 50s and what not, but they definitely help.

The 4.0 is a very warm base layer. I strongly recommend it, if you are going to be in cold weather.

Fantastic for those cold late season hunts, way better than the basic cold gear

Great fitting item /not bulky / WARM / EXCELLENT Choice

Avid fisherman here in RI, and once the temps dropped under 40 degrees, I knew I needed solid insulation without the bulk so that I could make my 100+ casts a night comfortably. These legitimately got the job done!

I work outside and wear multiple layers and this is the perfect base

Definitely worth the money. I work outside all day and stay warm.

This was a great buy, fantastic price and quality. Would definitely buy again.

Fits perfectly, keeps me extremely warm and dry. Love the comfort.

It's not even warm as the old ones anymore. PLEASE change back to the old design. I'm so disapp piointed.

Runs a little small.