Smooth Duo Legging with Built-In Underwear 21"

Regular price $129.00 Sale price $110.00
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Meet our signature time saving leggings with built-in underwear. Named 'Best Squat Proof Workout Legging' By Forbes and designed to be the perfect black legging for women, Smooth Duo® leggings are engineered to lay smooth over your shape and slay panty lines! Shine and thrive in the best black leggings you can own without the thought of a panty line, camel toe or ever having to find the right underwear. Workouts at the gym just got more comfortable, and living in this sleek design and supportive material will have you second guessing pants forever. Made in NYC. 

  • Inseam length 21" (measured flat)
  • Moisture-wicking
  • Four-way stretch
  • Soft and buttery hand feel
  • Opaque, squat proof fabric
  • Breathable 

Body: 88% Nylon / 12% Spandex. Lining: 90% Polyester / 10% Spandex

Machine wash. Tumble dry low. Do not iron. Do not bleach.

Product images show 5'6" model.

*If between sizes, we recommend the smaller size in this particular item. Need more guidance with your order? Get in touch with our support email address via the contact tab on our main menu.

We have a 30-day return policy, which means you have 30 days after receiving your item to request a return. 

To be eligible for a return, your item must be in the same condition that you received it, unworn or unused, with tags, and in its original packaging. Liners may not be removed at any time. You’ll also need the receipt or proof of purchase. Undergarments must be worn to try on all merchandise. 

Start your return process here:

We want our customers to be happy with their new products! Let us know how we can better help with sizing and finding the right product for you by reaching out to

Size Guide

  US Size Waist (in) Hip (in)
XS 0-2 23 - 26 34 - 36
S 4-6 26 - 29 37 - 39
M 8-10 29 - 32 40 - 42
L 12-14 32 - 35 43 - 45
XL 16 - 18 35 - 38 46 - 48
XXL 20 - 22 38 - 41 49 - 51


*This chart is meant as guide for our customers. In an effort to help us make sure we get it right, please feel free to give us any feedback regarding its accuracy in relation to your experience with our product. 

Customer Reviews

Based on 29 reviews
Lorraine B.
Size: L
Height: 5’ 5”
Fit: Correct fit
Activities: Lounging, Walking, Mat exercises or stretching, Low impact, Errands, Travel, Anything I
Best leggings for travel

I love my leggings! I have long, cropped and bike shorts. My favorite way to wear your leggings is when I travel. Whether it’s by car or plane Meira Active leggings are my choice for comfort.

Camryn S.
Size: XS
Height: 5’1
Fit: Correct fit
Activities: Anything I'm doing!

Absolutely love these leggings! The most comfortable leggings I ever put on. Fit was amazing!! Will buy another pair soon!

Calie Q.
Size: M
Height: 5'6
Fit: Correct fit
Activities: Lounging, Walking, Low impact, Errands, Travel

I legit love these leggings.

At first, I was skeptical as to how these leggings would fit, as I wasn't sure how the built-in underwear would feel. I also didn't know how the quality would be, as I had never shopped from here before

LET ME TELL YOU: I can hardly feel the underwear, and these leggings are butter smooth, AND THE QUALITY!! IS AMAZING!! They are now my new favorites to travel in and run errands in. There are no underwear lines, and all of my friends can't believe that they come in with built-in underwear! I have recommended these to everyone I know.

I am medium height, and the 21" is the perfect fit for me. I would recommend these if you are on the medium / shorter side!

I love Meira Active and I will continue to purchase from this store!!

Keep it smooth

We don't use side seams or a vertical back seam in our undies. We bring you our ingenious thong and comfy classic fit underwear built right into styles made to fit you and your life. We will never try to sell you a typical pair of tights.

Close up of women's hip and legs wearing smooth duo leggings with built-in underwear showing no panty lines or bunching. Snow covered ground with trees in the background

Why you'll love this

You're a human who moves

Shaped not to interfere with how your body moves, our built-in underwear acts as a lining to offer another layer where comfort is key. We always make sure there is no bunching or riding up. Next to weightless fabric is fit to stay smooth over your shape.

We do your work

Good news... Your leggings and underwear are already paired! You won't have to search the laundry pile or drawer again. Prefer going commando? Smooth Duo® leggings and shorts give you an unrestricted feeling of freedom yet let you reap all the benefits of undies.

named Best Squat proof workout leggings by forbes

Our Smooth Duo® soft black leggings with classic Built-in Underwear™ have been recognized by Forbes naming them Best Squat-Proof Leggings in 2022. We're always here for a good squat test.

Image of article showcasing Meira Active Smooth Duo Leggings with Built-In underwear being names the best squat proof leggings of 2022