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Outdoor Research
ActiveIce Spectrum Sun T-Shirt - Men's

4.4375 out of 5 stars
16 Reviews


Size Chart


Why We Like The ActiveIce Spectrum Sun T-Shirt

We stay active on even the hottest days, so the temperature-regulating tech of the ActiveIce Spectrum Sun T-Shirt is a necessity in our summer wardrobe. Outdoor Research tweaked their ActiveIce tech so it performs better than ever, dynamically reacting to changes in our body temperature to actively keep us cool.


  • Sporty t-shirt combats heat and solar rays on sweltering summer days
  • Stretch synthetic wicks moisture and matches body movements
  • ActiveIce technology reacts to increases in body temperature
  • UPF 50+ sun protection prevents UV rays from damaging skin
  • Item #ODRZ8NG
94% polyester, 6% spandex
Center Back Length
UPF Rating
Claimed Weight
run & training, hiking
Manufacturer Warranty

Overall Rating

4.5 based on 16 ratings

Review Summary

1 Stars - 0 reviews
2 Stars - 2 reviews
3 Stars - 0 reviews
4 Stars - 3 reviews
5 Stars - 11 reviews

Fits True To Size

Screen reader users: the following list provides a visual scale to illustrate the product fit. Please refer to the heading above for the fit type in text.
Runs smallTrue to sizeRuns large

What do you think about this product?


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4 out of 5 stars

June 8, 2024

Great in the beginning, but wears after wash

Innitially it was really good, the fit is right on. But the second year after several wash, the fabric just turns really soft and the whole shirt feels really loose and does not look as good. May need some change


Originally reviewed on

5 out of 5 stars

April 5, 2024

Great shirt for walks / runs on warm days

This ActiveIce Spectrum Sun T-Shirt is very comfortable and great for walks and runs on a warm day. It wicks perspiration well, and appears to be well made.


Originally reviewed on

5 out of 5 stars

March 16, 2024

light, breathable, comfortable

haven't yet had the opportunity to wear it in hot weather, but it's a good sign that it's warm and comfortable as a layer in cool weather.


Originally reviewed on

4 out of 5 stars

February 24, 2024

Pretty good, especially its color..

Overall good.. It's functional (I think from its material v. cotton) and I like the color (I got blue). Hope the color stays after washing it.. It's somewhat boxy (I usually like slim fit) but I guess it's normal fit.. Looking forward to trying other OR products..


Originally reviewed on

5 out of 5 stars

February 5, 2024

favorite new shirt

love this product. Next time they go on sale , I will grab every color


Originally reviewed on

5 out of 5 stars

November 20, 2023

Excellent Hot Weather T-shirt

The ActiveIce Spectrum Sun T-Shirt is by far the most comfortable hot weather t-shirt I own. The stretchy fabric wicks moisture and has a "cool" feel. I like them so much that I own four - two short sleeve and two long sleeve.


Originally reviewed on

5 out of 5 stars

September 1, 2023

Great shirts...need more colors!

5'10", 190#. Large fits great. Love how it stretches, excellent hand. Only complaint, it is physically heavy...wouldn't want to carry an extra in my pack.


Originally reviewed on

5 out of 5 stars

August 30, 2023

New favorite summer shirt

[This review was collected as part of a promotion.] I really like the ActiveIce fabric. Super cool and comfortable. I've challenged a couple of the light colors to stain with unfortunate spills and they've cleaned up really well with standard washing. I can't really think of anything negative to say, so giving this 5 stars easily.

John in Yosemite

Originally reviewed on

4 out of 5 stars

August 29, 2023

Thicker than I thought

[This review was collected as part of a promotion.] Really glad to have a shirt SPF 50. I live in the desert and need the protection. This shirt is a bit thicker and heavier than I thought it would be. Still a very nice shirt and will probably wear it in cooler weather.


Originally reviewed on

5 out of 5 stars

August 29, 2023

Coolest teacher around

[This review was collected as part of a promotion.] In addition to being a trail runner, I'm a classroom teacher in Southern California. I require professional attire that keeps me cool and doesn't provide fodder for middle school students to make fun of. I've paired my activeice t-shirt with the Astroman long sleeve to give a professional look that doesn't make me too hot or have embarrassing pit stains during hot SoCal school days. The activeice t-shirt transitions nicely into my after school trail runs, providing the same cool look and feel.


Originally reviewed on