Cold Chills when temp over 100

[OakLeaf]

They're white, so they keep the sun off, and turn solar radiation into heat less than skin tone does, even fairer skin. They're some super duper wicking fabric, which is why someone mentioned they have to be skin tight, so they enhance evaporative cooling (either from sweat or in drier climates, from water you pour on them). Even at worst, in hot and humid weather, they're no hotter than bare arms (trust me, I've tried both ways when it's been 90° and humid), so at least they prevent sunburn, which lotions definitely keep you from sweating and for that reason alone aren't very safe when it's hot.

I'm not sure how much of a cooling effect the sleeves add at cycling speed. With the air flow you get at even moderate speed, it has to be pretty dang humid before bare skin drips with sweat. On the bike, I mainly use them just to keep the sun off. I really notice the cooling effect running at lower temperatures. When it's in the 70s it's pretty hot to be running with bare skin, but the sleeves make it really comfortable.

[zoom-zoom]

I wore sleeves on a ride in Death Valley and they were awesome. In Michigan...not so much. It's too damned humid here, so they don't provide the same evaporative cooling. They actually make me feel hotter here. I think if a person lives in a desert environment that they'd be wonderful.

I've had that so-hot-that-I'm-chilled thing. It sucks...especially while running, since it's harder to carry adequate water.

[ny biker]

It gets plenty humid here and I find the cool wings work very well for me. After the ride, my arms and shoulders are dry but the rest of me is sweaty.

[Sky King]

As you can see from my photo, I ride in a sun shirt most of the time. I wear a sport bra underneath, the armpit area is vented and I can roll the sleeves up & down and they snap in place. I am not racing, just riding. Love the breeze as I go downhill. I have several. I also always, always carry a bandana, When it is hot I get it soaking wet and tie it around my neck to help me keep cool. Stopping, taking off your helmet and soaking your head is excellent as well.

[marni]

I often find one of those neck bandanas with the beads that swell up in water is useful.

I presoak it, fold it into a plastic bag, freeze it and then tuck it into a jersey pocket and break it out when needed. It is usually thawed out but still cool.

I also carry two bottles, one with electrolyte and the other with plain water so that if I get hot I can pour some over my head as needed.

I also always ride in a wicking cooler underlayer along with desoto arm coolers through most of the hot humid houston summer.

marni