Wondering how to pick a base layer

[Jolt]

+1 on the wool, and lighter weight would be best for your climate as far as I know (not that I have ever been there). Check places like Sierra Trading Post for good deals, and even eBay (I've found a lot of Icebreaker stuff there--some people sell salesman's samples on eBay and they go for much less than you would normally pay). As for fit, I will say that the Icebreaker tops are pretty long for us shorties but I don't find it to be a problem--would much rather have some extra length than have it be too short!

[Biciclista]

here's something for you:


http://forums.teamestrogen.com/showthread.php?t=33791

[BleeckerSt_Girl]

I like either Smartwool or Ibex brand 100% merino wool lightweight base layers.
Merino wool....all the way, for what you are describing you want.

[lph]

On short fast rides where I sweat a lot I prefer a wicking synthetic base layer.
On rides with more variation in intensity, or when it's very wet out, I prefer wool.

[Crankin]

I find the Ice Breaker to be itchy, but the Smart Wool micro weigh base layers are perfect. But I think even those would be too warm for when it gets to 60-70, if you have something over it. I lived in Tempe for 16 years and I know exactly what you are talking about. I would go with a Craft short sleeved or sleeveless base layer under a regular jersey, with arm warmers and a jacket, so you can remove the layers as it warms up. If you are going out only in the morning, then I would wear the micro weight wool as a base layer; I think they have short sleeved versions, so you might try that under your jersey.
I know that I always left my coat and gloves at work in the afternoon, because it was hard to remember a winter coat, when it was 70 degrees when you went home!

[azfiddle]

Thank you for all the suggestions, (especially Crankin, for your AZ experience) Sharon

[Owlie]

BF (from Mesa) says +1 on the Craft base layer, if you haven't already made your decision.

[azfiddle]

Still accepting suggestions. After all, despite a surprising 3 day cold snap last week, it's now back to record-breaking warm temps in the 80's and 90's this week. I'll look at Craft ....