Smooth Duo Bike Short with Built-In Thong 10"

Regular price $85.00 Sale price $68.00
Free Shipping

1 in stock

Smooth Duo® Built-in Thong Bike Shorts were created to slay panty lines.  A go-to for women who prefer neither bikini cut undies or full coverage options, these incredible built-in thong bike shorts fit like a second skin. With only the benefits of wearing underwear and none of the annoying details, this design was crafted to lay smooth over your front, back, and hips and offer a favorable amount of support to your mid section. Quick drying fabric makes this all day style perfect for rainy (or sweaty) conditions. No more camel toe. We're not just another activewear brand that was started by men and made for women. Stay in or work it out in Smooth Duo® bike shorts with built-in thong. Made in NYC.

    • High rise
    • Inseam 10" laying flat
    • Moisture-wicking
    • Quick drying
    • Four-way stretch
    • Abrasion resistant
    • Static resistant

    Heather grey bike shorts have black thong. Heather sky blue bike shorts have white thong with black liner.

    Body: 88% Cationic Polyester / 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 larger size in this particular item. Need more guidance with your order? For more information get in touch with our support email address via the contact tab on our main menu.

    Outfit Ideas + Exclusive Styling Tips!

    Our Heather Sky Blue bike shorts look great with cropped or oversized t-shirts and  tanks in white, light grey, or with a navy stripe. We also love this style paired with a navy sweatshirt or boyfriend fit sweater. Head to brunch without changing your clothing with a pair of fresh white kicks or slides in white, grey or silver, a sling bag or casual tote, and pair of your favorite sunnies.

    We love our Heather Grey bike shorts and leggings with black, white, or neon sports bras and t-shirts.  When you're not about the gym an oversized or cropped-and-boxy sweater or long sleeve tee in black, cream or soft pink can look pretty chic as well.

    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 5 reviews
    Size: S
    Height: 5’1”
    Fit: Too tight
    Activities: Anything I'm doing!
    Such a great idea!

    I love that I don’t have worry about pantylines! I’m normally a small, 5’1” 135lbs but a small was tight for me, I’ll have to order medium next time.

    Monique S.
    Size: M
    Height: 5’9” - 5’10”
    Fit: Correct fit
    Activities: Lounging, Walking, Mat exercises or stretching, Low impact, Medium impact, High impact, Errands, Travel, Anything I'm doing!
    Stays in place and keeps me cool while I exercise

    These Heather gray bike shorts were gifted to me as my family knew I was obsessed with Meira Active’s 26” long leggings (have had my black pair for 17 months and they have held up beautifully through frequent wear and washing and hang drying). These fit well and you are not even aware of the thong (which is how all thongs should feel IMO). The 10” bike shorts moved with me through a barre/pilates/cardio dance class, where I’m jumping, extending legs, on all fours on the ground, squatting and doing pliés. They kept me cool with their length, hitting just above the knee. They wick away sweat and dry quickly. These hug my silhouette but do not feel restrictive despite all the movement. The Heather gray color goes well w/ so many colors; it’s a wonderful core piece for an outfit for working out or running errands but a refreshing change from black. Highly recommend!

    Annette H.
    Size: M
    Height: 5’6”
    Fit: Correct fit
    Activities: Medium impact
    Great pants

    Fit nicely and love the undie’s.

    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