SmartWool PhD Seamless Bikini - Women's

Comfy, comfy, and more comfy.

There's nothing like merino wool for comfort, which is one reason Smartwool made the PhD Seamless Bikini out of that magical material. It also manages moisture, regulates temperature, and controls odor, making the PhD Bikini an obvious go-to when you plan on spending serious time outdoors.

  • Merino wool, nylon, and spandex blend
  • Seamless construction
  • Wide, covered elastic waistband
  • Varied textures for ventilation
  • Reviews
  • Q & A

runs small

  • Familiarity: I returned this product before using it
  • Fit: Runs small
  • Size Bought: XS

In other smartwool undies, with lighter fabric, I am a comfortable XS. (5'2", 108 lbs, 35-inch hips) This fabric is thicker and more compressive, and the XS is tighter and leads to some unattractive bulging.

I'm assuming a S will fit, haven't re-ordered in the new size yet. (And might not, rethinking the cost...)

runs small

  • Familiarity: I've used it once or twice and have initial impressions
  • Fit: Runs small
  • Size Bought: XL

I have been waiting for a new version of Smartwool's Hipster underwear and was hoping these would do the job. (I had been trying to replace my whole underwear drawer with the Smartwool hipster, but they stopped making them).

The quality is definitely MUCH higher than the original Hipster and Bikinis, with a thicker stretchier fabric, but the sizing is also MUCH MUCH smaller. I need an XL, so I am out of luck as far as sizing up.

Since I do think they're good quality, and I MUCH prefer merino vs synthetic for any and all active uses, I guess I'll just stop eating for the next month and hope they fit after that.

If you are a smaller size, I'd say you're in luck, and these would be great for you!

The 3 star rating was really for the size, and because until they fit, I can't give a real honest performance review.

Runs way small!

  • Size Bought: S

These are very tight. I even ordered a size M and they were on the tight side. They also felt itchier than the Smartwool NTS 150 bikinis. The material is much heavier than the 150 bikinis.

Comfort Briefs

  • Familiarity: I've used it once or twice and have initial impressions
  • Fit: True to size
  • Size Bought: small

My mom's favorite active briefs. Can't beat the wool for snow camping in wet snow. Keep them on and they are dry in the morning, ready for the next adventure.

Stitching is coming undone

  • Familiarity: I've used it several times
  • Fit: Runs small
  • Size Bought: small

I got a small based on how other SmartWool underwear has fit me in the past. It definitely a tighter material that doesn't loose it's shape easily. If I were to reorder I would go for a medium or large to avoid a cut in.

The stitching around the right leg hole started unraveling shortly after I purchased it. Pretty disappointed.

Because of the fit and quality I usually just save this underwear for laundry days.

Awesome briefs

  • Familiarity: I've used it several times

This briefs with elastic waistband is super comfy! For my hips 106-108 cm size M fits perfect. I'm really happy. I wore it only few times, so I cant say how durable it is. By the size chart I have to choose size L, but M is perfect.