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Protect any number of houses in the Men???s Under Armour Catalyst Shirt with the help of its UA Green, ArmourBlock, HeatGear, and UPF technologies. UA Green innovations have allowed this shirt to be made from a high percentage of recycled materials so you sleep slightly better at night. ArmourBlock technology neutralizes odor causing microbes so the Catalyst can transport moisture without scaring off the opposite sex while HeatGear helps you stay cool when things heat up. Ultraviolet protection allows you to run sprints until your body gives up without burning covered areas to a crisp in the hot sun.

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Bought for hiking trip

  • Familiarity:I've used it once or twice and have initial impressions

I bought this for a planned hiking trip in New Zealand (Milford Trek) which spans 33 miles over 5 days. I have only tried this on, but by comparison to other shirts I picked up (North Face Reaxion Crew & Flex Crew), I love this shirt the best!

Silky, fast drying and totally comfortable

    This shirt is made of a 100% synthetic weave, which offers some stretch, but has no lycra to wear out (like a lot of other under armor gear). This fabric is super lightweight and smooth as silk, yet resists pilling and lasts a long time.

    Like other synthetic shirts, this one will retain some level of stench, even through washings. This isn't an issue for me though, as I usually wear it outside.

    Sizing is loose but not baggy. Get one, you'll love how it feels


    Recycled polyester, not cotton

      First off, the shirt is 100% recycled polyester, not cotton like they have on the sidebar. With that out of the way...

      The shirt is pretty typical of other Under Armor Heat Gear shirts. Works well for getting rid of moisture & drying out quickly. Still has that polyester "shine" to it & looks like an athletic shirt for sure. Not something I'd wear if I wanted the same look as a nice cotton t-shirt due to the material & "shine" that it has.

      under armour T shirt

        I did not purchase this T shirt. It was given to me by my grand son who visited the Naval acadamy and gave it to me. It is one of the finest T shirts (with logo of the Naval acadamy written on it) that I have ever owned. The quality of it is outstanding and wears like a fine glove. I am searching the internet to find out where they are sold in my area
        Kudos for making this type of quality T shirt

        But aren't plastics toxic??? I was gonna...

        But aren't plastics toxic???

        I was gonna buy one of these shirts, but my girlfriend's worried it might be harmful to me. Seriously. She says lots of plastics leech out dangerous microbes over time. Same reason why so many people are against eating and drinking out of plastic containers.

        I contacted UA customer service and they couldn't tell me what sort of plastics (the safe or bad kind) they use for these shirts.

        Does anyone know if these shirts could potentially be toxic to oneself over time? Or is it a silly concern? Thanks!

        Best Answer

        This shirt is made of 100% recycled polyester, the above comment (and the info sidebar) are wrong.

        I'm not a doctor, or a research scientist, but I personally don't worry about the safety of synthetic fibers - and I've never heard a reason why I should. If you're really worried about it, but want something higher performance than cotton, check out baselayers made of Merino wool. Stoic, Smartwool, and Icebreaker are good brands.

        Simon, Dwayne:

        On UA's website it explicitly says the Catalyst T is made from recycled plastic bottles:

        There's even a video included.

        I'm all for going Green. But not if it involves recycling dangerous products. That makes no sense.

        Doesn't really matter what they made it from but it really is anti-microbal. I'm in the army and I was on a 10 day exercise in mid July and I only wore 2 shirts the whole exercise alternating every 2-3 days and trust me it didn't smell bad nor did I get a pimple outbreak therefore I confirm this shirt is AMAZING!

        I am looking for the loose fit in this...

        I am looking for the loose fit in this shirt. Is this it?

        Best Answer

        Hi Lyn,

        As I mentioned in my previous answer, the fit is "athletic". Inherently not a loose fit, but a comfortable fit, unlike the way lots of synthetic fabrics feel clingy and kind of gross. I personally hate that feeling, so to get what you're looking for in this particular shirt, I would suggest moving up from the size you would normally wear. That's the way I usually do it anyhow...all the upside of the shirt's technical abilities, but with the fit I prefer.

        Is this cut tight like a slim fit?

        Is this cut tight like a slim fit?