Hope M.wrote a review of Icebreaker Siren Hipkini - Women's on June 21, 2015
Familiarity: I've put it through the wringer
Fit: True to size
I have merino underwear by Ibex, Smartwool and PulseNaked (a small company in Colorado), and I like the products by those companies very much. However, for me these undies by Icebreaker are the best because of the fit and the fabric. They stay in place perfectly, never ride up, never slide down, never move around yet are not tight in any way. The elastic around the legs is thin and lies flat so it doesn't show under clothes and it doesn't dig in to you (or cause bulges). The fabric is very lightweight and breathable yet substantial enough you don't need to worry about ripping them when you're pulling them up (unlike the ultralight Smartwool NTS undies). The fabric is also great because of its anti-bacterial/anti-yeast properties. Seriously, you can wear these undies for several days on a backpacking trip and they won't retain odor. Also, when I started using merino undies for everyday wear I noticed fewer problems with yeast infections, etc. so I actually think they are more healthy for your body than regular cotton or synthetic underwear. Yes, they are expensive but they are totally worth it, and keep in mind they are quite durable. I usually get a couple pair of merino underwear a year and still have some that are six years old that are perfectly wearable. If you compare this to cotton or cheap synthetic underwear that you have to replace every year the merino is actually not that expensive.