Under Armour Base 4.0 Leggings - Men's


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Offering optimum warmth during bitter cold conditions, the Men's Base 4.0 Leggings from Under Armour are like wrapping a comforter around your legs. UA's heaviest leggings, its ColdGear Mega-Grid fleece is ideal for ultra warmth in the brutal cold or lower exertion activities. ArmourBlock® Anti-odor treated, this layering pant features flatlock stitching, ergonomic seam placement, raglan construction, and a performance waistband for an exceptional comfort fit. Its working fly adds convenience, while ColdGear Mega-Grid channels trap heat for maintaining core temperature. When facing the worst of winter layer up with the Under Armour Base 4.0 Leggings.


  • Fabric: 7.25 oz., 96% Polyester, 4% Elastane
  • Maximum warmth for extreme cold
  • ArmourBlock® Anti-odor technology
  • Flatlock stitching
  • Ergonomic seam placement
  • Raglan construction
  • Performance waistband
  • Working fly
  • Fit: Fitted

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Review Summary

4.6 out of 5

7 Reviews

  • Build quality: 6
  • Great design: 4
  • Performance: 4
  • Ease of use: 3

  • Cost: 3
  • Low performance: 1
Comfort: 5 / 5
Quality: 5 / 5
Warmth: 4.3 / 5
Fit: 2.6 / 5

7 Ratings & Reviews

Comfort: 5 / 5
Quality: 5 / 5
FitClothes: 3 / 5
Warmth: 5 / 5
from Winslow, NJ
18-24 yrs

Awesome purchase
December 20, 2011

Under Armour 4.0 leggings are very warm, got such a great deal, and the shipping was very fast. Very highly recommended. Buying 2 more pairs next week

Pros: Great design, Build quality, Performance, Great value
Comfort: 5 / 5
Quality: 5 / 5
FitClothes: 3 / 5
Warmth: 5 / 5

"fitted" not "compression" leggings
December 25, 2011

I have a disease that gives me poor blood circulation to my legs & extremities. As such, I've had to wear long johns under my my dress slacks each day I go into the office. No joke! These are my warmest & most comfortable leggings. The butt will sag on these after just one washing (despite following the care instructions#. I say this as a person with full hams and not one of those people with a flat butt to begin with : ) What's odd is the calves have still retained their original compression. Not that big a deal though since these are unseen long johns : # My second favorite is Duofold originals #two-layer) which cost a fraction of the price but the Duofold's aren't as nice. It's a bummer UA stuff never goes on sale but at least they have a lifetime satisfaction guarantee.

Pros: Great design, Build quality, Performance, Ease of use, Great value, Cons: Cost
Comfort: 5 / 5
Quality: 5 / 5
Warmth: 4 / 5

Another Great Under Armour Product
January 11, 2013

I've been wearing these throughout the winter and so far they've done a great job of keeping m' lower half toasty. Highly Recommended. The sizing seems to be a little off from last season (clothes seem a little smaller than before).

Pros: Great design, Lasts forever, Performance, Great value
Comfort: 5 / 5
Quality: 5 / 5
FitClothes: 3 / 5
Warmth: 4 / 5

Light and warm
December 23, 2011

6feet at 220 lbs and a perfect fit with the xxl. Best pair of warm legging underwear yet. UA has a winner with this one. If you have to be out in the bitter cold this series is the one you need. The tops are great too but they could be made even better with a button or 1/4 zip to aid in ventilation when needed.

Pros: Build quality, Performance
Comfort: 5 / 5
Quality: 5 / 5
Warmth: 5 / 5

January 11, 2012

Top quality product. Delivered by promised delivery date. I work outdoors in the North East and I have to say this is a great product to be wearing in 30 degrees or less weather.

Pros: Great design, Build quality
Comfort: 4 / 5
Quality: 4 / 5
FitClothes: 2 / 5
Warmth: 2 / 5
from Louisville, KY
55-64 yrs

Mediocre so far
January 16, 2012

Bought the Base 4.0 Crew Neck Shirt at the same time. I'm 6'2" and the inseam seems a bit short in the pants, shorter than other UA products. The top fits well. Although I haven't had any really cold weather to try them out, so far I'm pretty underwhelmed by the warmth. I expected to be HOT in sub freezing weather and I've been merely comfortable at the end of a two mile brisk walk. If I was sitting still at a winter football game I think I'd be pretty chilly. Even though I said I'd recommend, I still have reservations.

Pros: Build quality, Ease of use, Cons: Cost, Low performance
Comfort: 5 / 5
Quality: 5 / 5
FitClothes: 2 / 5
Warmth: 5 / 5
from HOME
45-54 yrs

love love love
January 01, 2012

This is a great pair of leggings. They are so comfy and soft , very quilted. These are stretchey. They hold up great in Colorado snow. Overall great purchase , Just very expensive.

Pros: Great design, Build quality, Lasts forever, Performance, Ease of use, Cons: Cost

Also Available

Under Armour Men's Base 4.0 Leggings Photo

Black/ Battleship/ School Bus.

Available sizes, while supplies last, include size small, size medium, size large, size extra large, size extra extra large and size xxxl: s, m, l, xl, xxl, xxxl.

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