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  • Under Armour - Base 4.0 Crew - Men's - Black/School Bus
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  • Under Armour - Base 4.0 Crew - Men's - Black/School Bus

Under Armour Base 4.0 Crew - Men's

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    • Black/School Bus

    11 Reviews


    Once the needle dips below 0 degrees Fahrenheit, it's just butt cold. Since you still want to ski, layering with the heavyweight Under Armour Base 4.0 Crew provides a good base for keeping the worst of winter at bay while you enjoy some fluffy turns on the mountain.

    • Heavyweight, four-way stretch polyester and elastane fabric maximizes body heat retention, breathes away moisture, and dries quickly if you take a hike in the afternoon
    • Flatlock seams, raglan construction, and ergonomically placed seams let you move naturally while skiing or boarding without chafing
    • Armour Block anti-odor technology in the fabric inhibits the growth of odor-causing microbes
    • Item #UND0478

    Tech Specs

    96% polyester, 4% elastane
    Insulation Weight
    Recommended Use
    heavyweight baselayer, sub-zero days, skiing, snowboarding, winter sports
    Manufacturer Warranty
    limited lifetime

    Tech Specs

    • Reviews
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    • Familiarity: I've put it through the wringer
    • Fit: Runs small
    • Size Bought: Small

    Everything that it's advertised to be. Warm and comfortable. I have used it in 20-30 degree east coast weather with just another layer and a light jacket and been a-ok.

    Warmest baselayer ever!

    • Size Bought: Large

    This is definitely the warmest baselayer I have ever seen. I like to be warmer than most while skiing, and this works great. It is even so warm that I often wear it alone under my shell. I only throw on a fleece if it gets below 20. If you want the warmest baselayer, look no further. This is it.

    Perfect for cold weather camping

    • Familiarity: I've put it through the wringer

    I've been rockin' the Base 2.0 stuff for all my winter activities (snowboarding / skiing / shoeing) for the past few years. The 2.0 works wonders if you're getting your sweat on, but if you're just lounging around the campsite, you're gonna need something a bit more substantial. I skipped over the 3.0 and went right for the heavy weight stuff.

    Paired with my Patagucci R1, I stay nice and toasty in this combo. Size wise I went with a Large (6 foot 1 @ 162lbs). I also wear a size large in their 2.0, but the 4.0 feels a bit more snug fitting.

    The 4.0 stuff is always quite pricey, so catch it on a sale or when they are blowing out last years version.

    Under Armour 4.0 Amazing

    • Familiarity: I've put it through the wringer
    • Fit: True to size

    This product will keep you warm in almost any conditions. Just don't wear it in the summer. The little thermal pockets trap in so much heat its unbelievable. The shirt fits snug and feels good. I would definitely recommend this product.


    • Familiarity: I've put it through the wringer
    • Fit: Runs small

    I was tired of wearing 4 layers when touring so I finally paid for a good base layer. By far the best investment in my clothing system. If you plan to hike or tour a lot, you will sweat a ton no matter how cold it is. I usually wear a wicking shirt over this to get the moisture away from my body. Also, Under Armour designed these to not be a real tight fit, it shouldn't fit like spandex. I usually wear a large but had to get an extra large for mine to properly fit my arms. I'm 6'1" and 150lbs. Seriously the best base layer you can buy.

    Great product

    • Familiarity: I've put it through the wringer

    I use this almost every day to golf in the Cold PA winters, and just this and a heavy sweater makes the cold bearable. I used to have to layer up to 4 items, now 2 will do the job

    If I order two of these today can I get...

    If I order two of these today can I get it by 12/19/13