Weight 110-145lbs

Height 5'4" to 5'10

NO EXCHANGES OR RETURNS (Medium runs similar to a small)


-94% Polyester / 6% Spandex 4 way Stretch 1 Sided Brushed Polyester

Designed to be used ‘next-to-skin’ as a first layer
Comfortable between temps -5°F to 70°F with an uninsulated shell.

Wear with your favorite Outer shell, or wear as a combo layer with the shadow jacket, storm coat, or one of our hoodies for extra warmth


– Unrestrictive Full Range of Motion
– First Layer for All Activities

    Weight 12 oz
    Dimensions 12 × 12 × 3 in

    Customer Reviews

    Based on 7 reviews
    Jaime Zamora
    The search is over!

    Was finally able to test my BasePro Crew, there I was thirty feet in the air working in my bucket truck on a very windy and chilly day here in the desert. I wore the Crew and a light work issued windbreaker and was very comfortable. The best thing about it was not having to wear bulky layers! Having worked 24 years on the ground and in a bucket truck on cold, windy days and even colder nights, this gear is what I've been looking for. It does what Fortress says it does and I am GOD blessed to have found it!

    Mark Thompson

    I’m very happy with my purchase. I will spare no expense to be warm at work as I work outside. The base Pants. I have felt no cold come through to my skin with just the base pants and my insulated Carhartt overalls on. The base shirt also is nice and warm. The only thing I wish you would of done with that is insulate the sleeves. My arms are getting cold and it runs up into my shoulders. But nothing is cold from the top of my chest down. I wear a Sherpa lined sweatshirt over that. I haven’t got to try the socks yet. Actually got them on right now. Going to try to see if my foot will go into my boot. Got your storm jacket. Definitely way way warmer then my Columbia Jacket. Going to give that away. I tell everybody about your product. Not sure I’m ready to jump in a lake yet to give it the ultimate test. If I do fall into one I’ll let you know how it works out (-: I also like the fact that I don’t have to put many layers of clothes on like I was doing. Usually 4 pair of long underwear to start with. I’ll be look at anything new you come out with.

    The best!

    From upstate NY, this is my third product from Fortress. I love it! It is perfect for layering when I am skiing, snowmobiling, or ice fishing! Holds the heat, but breathable. Perfect for the colder days when you want a little more.

    Jennifer Johnson
    Happy to be outside!

    We have had a cold spell the last week in southern Idaho where it was in the low teens for a few days. I am super happy to report that we stayed warm!!!! I am so thankful for the fortress base layer and jacket! I just wish now they come up with some gloves with finger dexterity! I have already told several friends about fortress! Love the brand.

    Christopher Fritz
    Works very well!

    I was on Lake of the Woods in - 27 degrees temperatures and the worked great!

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