The XS fit perfectly! I'm 5', 34c, 112# & since I'm so short often have problems with the shoulder straps of tanks being too long but not with this one. It also has a nice soft feel to it & wasn't tight around the middle (I hate it when an XS top feels like a girdle!) The yellow was absolutely beautiful- soft, not TOO bright. I wore it on a very hard hike & it got absolutely filthy- I was worried I had stained it as wasn't able to wash it until getting home several days later- a little spray & wash & it came out like new! I want one in every color!My wife loves this as a base layer when flying to/from Hawaii from Northwest to visit her dad...strip down to it when too hot in Hawaii, layer over it when closer to home. The dotted version is less revealing than plain color version given slightly snug fit of medium and thin fabric. In Hawaii it was cooler than a light weight cotton tank with a higher cut in front and back. Length is ok when worn with old fashioned pants or skirts that come up to waist level, or close to it, rather than lower rise.Bought 3 colors of this shirt and took them to Asia during hot summer months. Hand washed them every night but the hem started unraveling on all three on the left side after 2-3 weeks.This top is soft, thin, and perfect for the too-hot weather we've had this summer (many 90° days). I ordered it to wear doing outside chores and play, but it's too nice. Perfect for casual outdoor social events. Seems to keep me cooler, but I'm not sure if the "freezer" component of the shirt is doing it as I haven't yet worn it out in the heat for a long period.First of all...this is NOT an Omni-Freeze product. Maybe it once was, but I have other Columbia Omni-Freeze items, and this has neither the Omni-Freeze tag, nor the fabric appearance of such items. Also, it runs a bit small, so is quite form fitting. And the Amazon photo of the back of this top is misleading. My bra straps are clearly visible in the back because of the wide cut of this top, but I don't see bra straps in the photo provided. Maybe the model isn't wearing a bra?Beautiful pattern and color, and the material of this top is amazing -- it really keeps the skin cool! I wear mine with a sports bra and the straps are perfectly hidden. The fit is snug just as you see on the model. If you're between sizes, you may want to go with the larger size.Love the style & fabric. ran a bit small for me.Runs big around and is a little short through the length.