It's 2 oz and you can get one for less than $20. You could have had all the water you needed.

In reply to 'Nachoman' owning "about 5 different brands of baselayer." Be one of them of the same name, involved in the controversial "$200.00 jersey"?

1 factor that no one has spoken of in this entire thread yet: the variation in each person-to-person, Rider-TO-Rider,
via Body Fat each one has.
As body fat adds warmth.

That and how different individuals handle the heat.

I'm assuming that's a water filter. I don't see where that would be useful if I'm not crossing water sources. On some routes I do cross a ditch or even a creek, but I can't see climbing down a steep and overgrown bank while wearing road shoes to get to some water unless I have no alternative to survive.

Do you live in the Sahara desert?

A popular ride out here is the North Cascades Highway; I'm guessing it's the ride Carbonfiberboy was commenting about not having enough water on. For about 50 miles with maybe 6,000' vert, there are no stores, no water fountains, no potable water of any kind. But there's a creek every mile. Most of the ride is through the desert, the creeks drain high glaciers and snowfields. CFboy suffered needlessly when he ran out of water in the hot(ter than he's used to) sun; this is a simple, light, cheap way to have avoided it.

That's a Sawyer Mini water filter, they run $15 to $25, weigh 2 ounces, and it's smaller than a spare tube.

Yeah.. sorry, you can size these down one size for more skintight and slightly shorter. I'm 6'2" and the length was OK with me.

I wore the UA baselayer on my mtb today with a loose fitting tshirt...worked much better than with a skin tight jersey.

yes, UA's textile is the best I have tried, it really keeps you cooler

Same reason some folks buy $7000 bikes

In summer I never wear a base layer. Who wants an extra layer when hot. Silly idea.

https://www.performancebike.com/bike...ductId=1174040
i want this base layer it matches my six pack and pecks NOT

A summer baselayer is not a heat insulator. A silly idea is riding around like a wet clam.

You see I'm not wet- until I stop.

Old post, but to make it clear: this is patently not true. There is no feedback system that would stop sweating once the skin is wet enough. The sweating only stops once you are cool enough, or once you are too dehydrated.

Obviously if you don't sweat then it serves little purpose. Ride harder.

Actually, I find the castelli mesh jersey, like this one, keeps you cooler than the UA option when wearing a tight fitting race cut jersey. The UA option worked well with a tshirt, but I'd never wear a tshirt on a road bike. That said, I will still opt for no baselayer 99% of the time. Almost all of my jerseys are race cut and do a fine job of wicking away sweat and keeping me cool. Wearing a baselayer with them, seems to just keep the sweat on you or between the two layers.

Exactly.

I haven't been posting much lately and I especially haven't read this thread, so in case this hasn't already been said by someone else I did a trial run and found these very unscientific results.

High temp, low humidity - lightweight moisture wicking base layer = good
high/moderate temp, high humidity - moisture wicking base layer = bad

Evaporative cooling works best when there is little moisture in the atmosphere.

Every layer adds some insulation and the combination of bibs and jersey is already 2 layers over much of the torso, adding yet another layer seems unnecessary when maximum cooling is required.

Regardless of whether it insulates, it also doesn't appear to add any value under a tight moisture wicking jersey. I don't see many pros using base layers when it's hot.

The bibs and jersey are unnecessary too. I just wear appropriate pants and a base layer. The only thing I'm missing from the jersey is that look like my back is pregnant.

I also have and love the Rapha Merino base layer both long and short sleeves. However the rapha mesh base layer, short sleeves and sleeveless, much better in the warm weather times. Plus in typical rapha fashion, they have cool sayings written on the front like "Sometimes you're the hammer, sometimes you're the nail" on the the short sleeves, and even cooler than that "Allumer la Meche" on the sleeveless which of course as all cyclists know, in French means "Light the Torch" and as the only thing more important than being cool is looking cool, this is priceless equipment.

Never wore one for over 30 years but used an Assos sleeveless and I like it. Can't really define why.

The dhb lightweight mesh base layers (from Wiggle) are pretty fantastic for around $25. Super soft.
I have other Rapha clothes but there's something about paying $70 for a mesh tank top...

I've been wearing the same Performance mesh sleeveless tees for years. In all weather, all year until temps hit 90, then I go without. (Don't worry, I bought enough pairs that I always put on a clean one.) One of the best pieces of cycling gear I've ever owned. Never felt any need to look elsewhere since I bought them. (Performance apparently did feel that need and have carried other tees but not those since. Too good - customers weren't coming back because they held up so well?)

Ben