Summer is for not wearing shirts.

However, when I do, I am fond of Under Armour Heat Gear stuff. I recently got a long sleeved white one that is basically just like wearing sun screen. Sweat evaporates quickly, and I don’t get too hot

If it's humid out, there isn't really anywhere for your sweat to go. It won't evaporate faster than you sweat it out.

I don't think there's a fabric that exists that'll stay dry while you're running if you're a heavy sweater. And I'm one too. The best you can hope for is one that dries quickly when you stop sweating.

I'm a big fan of all the Twilight stuff from tracksmith. Super light and minimal chafing when wet

As far as shirts go, I think the best I have used is the Rabbit EZ Perforated shirt. I’ve used it for summer trail ultras and hot road marathons. It wicks well, doesn’t stick to your skin, and the perforations make it breathe super well.

I just go without a shirt and put on sunscreen

Patagonia has a number of light shirts that work Well. Shorts are a bit tougher but I’ve had decent experiences with most new balance (lined).

Personally I think Under Armour makes some amazing stuff. Highly underrated

Nudity

Jkish, but I like Nike Aeroswift singlets, they get peeled off after 10km tho cuz im a sweaty beast

I buy used vent tech lulus for around 20 to 25 bucks on eBay.

SOAR 

100% Merino Wool.

Nothing is gonna make you not sweat (except for maybe antiperspirant, and I have reservations about that and it's links to things like breast cancer), and your body SHOULD sweat to help cool itself. But, Merino wool is one of the best moisture-wicking fabrics in existence. It is a natural fiber, it lasts longer than most, and it will also help keep you from getting too schmelly. I have three Icebreaker Merino wool shirts I wear when backpacking and I can wear one of them for 3-4 days straight of my nearly 300lbs ass squatching around in the woods, mountains, and desert without getting noticeably ripe.

I'd recommend looking at Icebreaker, Minus 33, Mons Royal, and Smartwool, for starters

embrace the moisture, there isn’t any material on earth that is going to dry while it’s still on your body underneath a carrier or back pack. any poly athletic blend that is mean to be wicking will be better than 100% cotton.

Velocity Systems boss rugby shirt.

Avoiding cotton and avoiding padding on gear are the best things I've found. Not great, but they help.

I don’t mind the sweat, it’s when the salt crystals get all itchy is when things are miserable.

I've realized over my many years of running ultras that there's no winners. Because I just stink up the shirts I buy cheap Walmart Athletic dry wear. They $10cdn a pop amd work as well as the more expensive shirts I've tried.

I’ve had good luck with Rabbit shirts. If I’m exposed sun the long sleeve sun shirts are pretty nice. I am usually running in lots of sun in Phoenix, AZ

Fishing shirts. Almost any kind will give SPF 30-45, dry quickly, and probably cost less than anything you'll find on REI or at a store.

You might just be a heavy sweater. Have you considered going shirtless?

To find the best sweat wicking shirts, just try them all on in stores etc. The thinner tops will of course be better.

Whilst asking for ideas online it’s best to try them on yourself, unless you understand materials used in clothing.

Thanks for posting. I got a Cormac tshirt for running in hot weather and it works like a charm, though it’s not the 95% cotton/5% spandex. Anyone else try any of the other shirts?

I really do feel like a shill for the amount of times I post this (I am not affiliated with OR in any way, but do receive Pro pricing), but IMHO, nothing compares to Outdoor Research's Echo line for me. I absolutely dread the heat and this is the only thing I wear when I have to go out in the sun or on the water. I can't explain how much I hate hot weather, I hate it. Now I'm angry cause I'm thinking about it!

I've used the Cormac, the Motus, the Remige, UA HeatGear, Icebreaker stuff, Columbia PFG, Ex-Officio, you name it, I've probably tried it. Velox is next on my list.

I don't know what the hell it is about the Echo series that works, but it's the only thing that works for me. I have a drawer full of Gen2 hoodies, wishing I would have bought more of the Gen1 with the small zippered pocket. They are fragile, easily destroyed, and smell after being worn once, but OR could double the price and I'd continue to buy them.

An interesting article. This makes me wonder why Icebreaker adds Tencel to their materials.

We don’t talk much about warmth weather apparel here. And in winter the priorities change quite a bit. Interesting discussion, I’ll start.

I personally am fairly on board with wool for 3-season trips that are always above freezing during the daytime. It doesn’t get crazy saturated like cotton, and doesn’t chill you like crazy. You can still soak it in some water on hot days and use the enthalpy of vaporization, as well as borrow water’s effusivity of ~1600! UV resistance is good, and it resists smell much better than synthetics.

However, I think you need to have those warmer days to dry it out. It doesn’t work nearly as well below freezing, and increasingly less well as it gets colder. Plus the primary need for cold weather is to remove water immediately, and less about cooling off.

I'm not a fan of how the article is worded. It was worded conclusively that cotton is the go-to, but the researchers simply found that cotton has the highest thermal effusivity. They touch upon it at the end, but there are so many other factors that come into play regarding high temperature comfort such as wicking, airflow, fabric texture, skin types, wind, activities, etc.

Polyster and synthetics work because they wick moisture well, and wicking moisture prevents the material from sticking to the skin allowing for more airflow.

I'm interested to see the actual study concerning effusivity and thermal comfort/sensation.

In the literature review section of this 2017 study of an active particle infused synthetic shirt versus a regular synthetic shirt or an ice cooled vest, they note that:

>Although popular in recreational activities and sports, synthetic clothing does not appear to effect thermoregulation or performance compared to natural fabric clothing in warm and hot environments (see reviews [9, 11]).

According to the 2013 review study cited in that article:

>The majority of the research analyzing advertised synthetic fabrics has shown no difference in thermoregulation or clothing comfort while exercising in those fabrics in the heat compared to natural fabrics.

There is a lot going on here in terms of a multiplicity of variables involved in both perceived comfort and actual thermal balance and performance. Cooling via evaporation would seem to be a key component in all of these, but this study found that:

>In summary, a synthetic fabric that improves sweat evaporation does not provide a thermoregulatory, physiological, or comfort sensation advantage when compared to cotton in moderately warm environmental conditions.

This runs counter to my experience, as like others have mentioned, I find the Echo type fabric (I use Rab Pulse) to be the most comfortable/effective for me in terms of hiking in warm weather. Most studies, however, seem to suggest no tangible thermoregulatory or comfort advantage of synthetics over other fabrics in warm conditions.

Call me old fashioned but cotton pocket tees are my go to shirt. I've tried technical fabrics and poly cotton blends and while they generally perform better at keeping me dry, they have a way of turning sweat into really funky odors. Cotton, not so much. if you haven't tried wool socks, buy a few pairs. They might cost a little bit more, but when you take off your boots at the end of a long day and your feet are dry, you'll know where that extra money went.

I just discovered an underwear brand called Krakatoa. Marketing all over FB. It's the most comfortable boxer briefs I've ever felt. Literally disappears on your skin, no thigh sticking. A little pricey.

Linen is the best for outer clothes, like shirts, shorts, or pants. I have a knit linen blend short sleeve shirt that feels like I'm wearing nothing. I wear that on the hottest days.

Stay inside with ac. lol

I've had great success with "32 Degrees Cool" "unmentionables".

For shirts, quick-dry anything is great. "Amazon Basics" sweat wicking shirts are great.
Additionally I have a lot of them and, if expecting to sweat a lot, carry one or two with me for backup/change.

If you need to wear a business suit, definitely try an Underarmor compression undershirt.

Vuori Zephyr or Tradewinds. Zephyr is my favorite material of any active shirt I own. XXL fits me great at 6’6” 260lbs. 93% polyester 7% elastane. They also always have 15% off first order if you subscribe to their email list.

Lululemon. I hated buying a $68 tee shirt with every ounce of my being, then I begrudgingly bought a drysense tee and immediately ordered 4 more. The xxl is almost too long for my 6’6” body. (Not a tall size, just very long cut)

These look great! And the price is about what I was paying for my current brand.

American Tall has nice 100% poly exercise shirts... not sure if that's what you're exactly looking for, though.

Mons Royale can do some longish clothing as standard

Rabbit - EZ Tee Perf SS

I’ve got 4 of these and they are great.

https://www.runinrabbit.com/collections/mens-short-sleeves/products/ez-tee-perf-ss-trail-mens

Capilene cool is awesome. Personally love rabbit ez perf as well for warm weather but may not hold up as well under a vest

Patagonia Capilene cool lightweight is what I use for my warmer ultras

Cap cool lightweight!

I really like Janji shirts and shorts. They ventilate better than others and dry fast. Also, I often choose Arc'teryx shirt - not sure what the name of the model is. Also, I have a higher end perforated Salomon shirt that is very good.