Customer Reviews Under Armour Base 4.0 Crew

Runs small. I’m always a size small in nearly every brand, and I need a medium for this. There is very little stretch, so even in the medium, it feels constricting. Plus, the neck opening is so small that it’s difficult to get on over my head (impossible to get on while wearing my glasses) and it feels a bit like it’s choking me. Ironically, the zip neck version of this top has too loose of a neck! Argh.

Got this for my daughter, she is a teacher. Her room is cold and then she has bus duty periodically. So the 4.0 is perfect for being somewhat sedentary. Surprisingly, actually keeps her warm! She is a chilly person normally, so cold temps are miserable for her. We've tried many products. The Under Armour is work the investment!

I am always cold. This is the solution! Love it!

The 4.0 top and bottoms are warm as toast. Bring on Winter

The fit is loose but not so lose that I would exchange for a smaller size. The shirt is warm but not too warm when inside. Outside it keeps me toasty at 30 degrees and Im always complaining of being cold. All in all, Im very happy with this purchase.

Very comfortable, warm, and correctly advertised

Warm, thick, and Quality Baselayer Top. It just 2 inches longer than most brand. I hope that you can me the top and the bottom 2 iches shorter. Than It would fit me perfectly. Great product!

Completely disappointed with the new version, was not warm at all. Will be returning. Please bring back the original!

This is a great base layer and is comfortable under my ski jacket and pullover.

I rely on under armour to keep me warm in cold weather conditions. The 4.0 is my #1 go to during the winter for outdoor activities. It is comfortable, easy to layer on top of it and just overall does what it needs to do.

Gift to mom, she gets cold easily. And I swear by them, for work or play.