The wool is nice but I still get weggies. I try to use these on high activity days where I’m going to sweat a lot- gym, skiiing etc… They are breathable, I just prefer a different style.

Love The Material But Not The Fit

I'm a M/L for underwear and bought a large but they don't cover my crack when I'm sitting. Alternated between 2 pairs for a 3 week rafting trip and loved the material but wish fit my butt, got quite annoying when rowing.

Very nice, soft fabric. Doesn’t lose elasticity like some other merino wool undies I’ve tried. Comfortable, and helped wick moisture during workouts!

Underwear Worth Treating Yourself To

Once I went marino and specifically Icebreakers, I could never go back. There's no comparison to thick swampy cotton underwear living in the south or sweat/stink holding synthetics (and messing with your lady biome) after long days running on the trail. Seriously, these fit great for me (size: sm, 5'3" 120lbs, athletic build-runner) stay in place, and never smell. The only reason I give them 4 stars is because I have been buying these for a decade now, and in recent years, they do seem to wear thin faster.

Not For Big Booties

Ordered a size large and still tiny... not for women with backsides

My Favorite Daily Underwear

This underwear is soft and is the right shape for my booty and doesn’t ride up and give me a wedgie. I’m usually a small and the small fits perfectly. The merino means I can work hard and sweat and it doesn’t stink, and it keeps me healthier down there. I can just as easily wear these in my daily life or playing in the backcountry. They hold up well and I’ve had no durability issues.

Great Product, Very Comfortable.

The fit and fabric quality was great. I had read online to size up if you were on the edge based on measurements and that was correct for me. Typically between an XS and S. Went with the small and they are perfect. This item is good for anyone looking for nature underwear. They are thick enough to last well but thin enough you could wear them even in hot climates. If you want the ditch the plastic underwear try these.

Durability Issues

Similar to the other Siren products from Icebreaker, these seem to have durability issues. The pros are fantastic: comfortable, moisture-wicking, and anti-odor. However, the wool blend appears to be very thin where pilling is occurring, and some parts are getting very see-through. I'm not sure how long these will last. Moreover, they easily lose their shape and go from hugging my body to riding up by the second day of continuous use.

The fabric wears out very very quickly and develops holes easily. The sizing is also small and the bikini style doesn’t sit right in this cut.

Great product. Runs big though. Used on a canoe trip in the wilderness. Easy to wash while out camping and dried quickly.

Love These Undies!

[This review was collected as part of a promotion.] I love these undies. This is not my first review for them. This color is a little muted, but that's probably a good thing to add to the collection. Highly recommend for fit and comfort- five stars.

Perfect Merino Undies!

[This review was collected as part of a promotion.] I've learned that merino underwear are essential for travel. Unlike cotton underwear that usually don't dry overnight and need assistance of a hair dryer (if available), merino underwear are dry and ready in the morning. We only need to have two pairs-- one to wear, one to wash. I like the fit, comfort, and color of the Siren Bikini.

Best Underwear

I have 5 pairs of these and wear them when doing anything active or traveling. They are lightweight, quick dry, breathable, everything you want in an underwear. I am 5'5, 135 and got size medium, they fit perfect. I wish all my underwear were wool!

Cute & Comfy

[This review was collected as part of a promotion.] I was hesitant about merino wool at first but have become the biggest fan! Perfect for a hike or everyday wear

Awesome!

[This review was collected as part of a promotion.] First time buying from Icebreaker and I'm a huge fan!