Can't say enough of how great merino feels, even when wet. Will not be going back to cotton or synthetic. As for sizing, I am a regular small and don't like my clothes to fit snug so purchased a medium - fits great, comfortable and not loose.

Decided to try Icebreaker tees because my boyfriend kept raving about his (he's an avid hiker). Got my order just in time for a trip to northern California -- it packed great (light/not very wrinkle-y) and I wore one of them repeatedly, forgetting about the other shirts I brought. It performed as Icebreaker claims: not itchy, odor-resistant, wicks away sweat. I also felt comfortable despite the temperature changes (low 60s to low 70s). Plus, they look good enough to be versatile. I wore the tee for walking around town and also for doing active stuff. And even after we went biking across the countryside for five hours one day, I was still able to wear them again the next day without feeling gross. I love these tops! I know they're a bit pricey than other shirts but well worth the cost -- I ordered four more Icebreaker items when Backcountry had them on sale.

This is my first icebreaker top and I love it. It does itch slightly at first but is otherwise a great base layer. The blue is really pretty and the size medium works well as I am a 6/8 normally. It really does cut down on body odor as well.

This was my second Icebreaker purchase, the first being 260 weight zip turtleneck (it has thumbholes... loves it!). I do not find their shirts to be itchy at all!

Most importantly, they have a very flattering fit for a woman's body... Slim, but not too slim, with a flare at the torso for the girls, and another at the hips, which brings me to another important point about the fit... These are cut long enough that they can be tucked in, or if they are not, you won't reveal anything unintentionally when you bend over in low rise jeans...

I can't say enough good things about Icebreaker... sustainable, washable, and the wrinkles from air drying disappear as soon as you put it on!