Please Select Your Size

Extra Smallflex (XXS/XS)

Be Flexible Seamless Onesie - Black

$33.30 $74.00

Color: Black
French Roast
Size

This item is FINAL SALE. No returns or exchanges will be accepted.

Every wardrobe needs a staple one-and-done. Designed in our signature Seamless fabric, this full-length onesie seamlessly moves with you from studio to street. 

 

Fit Stylist Tip: Keep in mind it's super stretchy! If you are in between sizes... for a more sculpted fit go down and for a more comfy fit go up!

Features + Fit

• Anti-cameltoe
• Moisture-absorbing cotton gusset for panty-free movement
• Waist snatching ribbed panels
• Inner shelf bra
• Squat-proof
• Heart-shaped booty lifting back seam
• Sweetheart neckline
• Ultra scooped back
• BYO-pads
• Full-length onesie

Inseam length varies on your size:
Extra Smallflex: 23.5” (59.5 cm)
Smallflex: 24” (60.5 cm)
Midflex: 24.25” (61.5 cm)
Curveflex: 24.5” (62.5 cm)
Extra Curveflex: 25” (63.5 cm)

Model Info
Model: Brynne Height: 5'5" Bust: 31" Bra: 32B Waist: 24" Hips: 35" Torso: 61" Brynne is wearing size extra smallflex
Fabric + Care

93% Nylon, 7% Spandex

Care: Please wash me cold then hang me to dry, ok? Oh, and I don’t like bleach, but if you must, non-chlorine only…or else. Thank you! ♥︎

Shipping + Returns

FREE SHIPPING in the U.S. on any order over $100!

Order amount: $0 - $99.99:
$7.95 U.S. shipping (+$2 for yoga mats or bags)

Order amount: $100+:
FREE U.S. shipping

U.S. expedited shipping
Order amount: $0-$299.99: $25
Order amount: $300+: $35

U.S. expedited orders are shipped 2-day shipping allowing 1-2 business days for processing.


International shipping charges vary by country. See Help Center for rates.

FREE SHIPPING to Canada and UK with qualifying cart total!
Canada: Orders over $250CAD
UK: Orders over £150 GBP
*duties and taxes still apply*

DELIVERY TIME: Please allow 5-8 days for delivery of your order if in the U.S. Please allow 2-4 weeks for international orders to arrive depending on each country's customs inspection and postal delivery practices.

HOLIDAY RETURNS: For purchases from November 1 to December 3, we will extend the return window to 60 days.  All orders between December 4-10 will have a 45-day return window, and any order placed after December 10 will have our original return/exchange policy deadline of 30 days.


RETURNS: Returns are complimentary with Checkout+ and are accepted within 30 days of purchase. All items must be in unworn, unwashed condition with all tags and adhesive liners intact. If you do not select Checkout+, you will purchase a return label inside the portal. Each return must use the label provided and multiple orders cannot be combined with one label.Your initial shipping charges and optional Checkout+ will not be refunded; only the returned items are eligible for refund. International orders that do not have Checkout+ can purchase return labels inside the returns portal.You will not be refunded for initial shipping charges or any customs/taxes required for delivery. International orders with Checkout + are not eligible for exchange only returns.
Items marked as final sale and gift cards are not eligible for return

EXCHANGES:  Customers in the U.S. who selected Checkout+ are eligible to make as many exchanges as needed to achieve their perfect fit provided all exchanges are completed within 30 days of purchase.  If you opt out of Checkout+ we offer two complimentary U.S. even exchanges within 30 days of purchase. Should you need more than two even exchanges you can purchase a label inside the portal. To be eligible for exchange all items must be in unworn, unwashed condition with all tags and adhesive liners intact. All panties must be returned in their original sealed bag with all tags intact. Items marked as final sale and gift cards are not eligible for exchange.

Eligible items in the required condition can be exchanged for any product in the store. An even exchange is defined as changing the size of the same item. If selecting a new item or color of the same item, you will be credited for the amount paid and you will be able to shop the full site with that credit.  If there is a price difference you will either be credited to your original payment method if the item selected is lower in price, or you will be prompted to enter your preferred payment method if the item is higher in price.

International orders are not eligible for exchange we are only able to accept returns from customers shopping outside of the U.S. 

  • 5 stars: 87 (43%)
  • 4 stars: 55 (27%)
  • 3 stars: 37 (18%)
  • 2 stars: 16 (8%)
  • 1 star: 8 (4%)
Some of the reviews shown are from related products the merchant grouped with this one.
T
T
Height: 5'3" FT (160 cm)
How does it fit?:
Runs Small
Runs Big
Bra Size: 42dd
Size Bought: 1X
Normally Wears: 2X
Body Type: Hourglass
Not for larger chests

Luckily I got this on super sale for Black Friday. The lack of pockets really sets this back. This is also not ideal for larger chests. I wear a 42dd and my chest wants to spill out of this. Also due to the material being a bit slick it falls down all over so you have to pull it up consistently. It’s super sexy though and worth it at the $22 sale price

I
Issy
Height: 5'0" FT and below (152 cm)
How does it fit?:
Runs Small
Runs Big
Bra Size: 36C
Size Bought: XS, S
Normally Wears: M
Body Type: Full Bust
One size fits most

I have an uncommon body shape: petite body but a medium sized chest. While the onesie is flattering, the straps are uncomfortable and don’t sit perpendicular to my shoulders (so they are at an awkward angle unless I fix them). I really hope PopFlex makes this into a leotard with no legs, because then I would’ve gotten the medium without worrying about the leg inseam sizing. Otherwise, the fabric is great - stretchy and breathable. I don’t know how other petite popflex models with C cups wear this size comfortably, I’m definitely a little envious. Because of the shoulder straps, I don’t know how much I trust this for aerial silks which is what I bought it for. Hopefully some fabric tape will solve the shoulder straps because everything else is great.

L
Luiza C.
Height: 5'3" FT (160 cm)
How does it fit?:
Runs Small
Runs Big
Bra Size: 30A
Size Bought: XS
Normally Wears: XS
Body Type: Hourglass
Good, but Popflex has better options

The piece fits great, however I do believe Popflex has other models with more features. One thing I would improve is the addition of pockets (like most of their leggings). I would also have preferred if it already came with bra pads, since I have a flat top and look quite childish without them. This doesn’t mean the product is bad though, specially for the price in promotion. Just not their masterpiece. Cheers to the brown colour, that is really gorgeous.

C
Corielle H.L.
Height: 5'2" FT (157 cm)
How does it fit?:
Runs Small
Runs Big
Bra Size: B
Size Bought: XS
Normally Wears: XS
Body Type: Hourglass
Obsessed

I've worn this so much this fall and winter. It's a great exercise outfit. I'm a Zumba instructor -- so moderate impact exercise mostly -- and this provides great support for that. It also serves as a great under layer for fall sweaters/jackets etc

M
Maria P.
Height: 5'4" FT (163 cm)
How does it fit?:
Runs Small
Runs Big
Bra Size: 34D
Size Bought: S
Normally Wears: S
Body Type: Hourglass
The stitching is unraveling!

I really loved this onesie when I first tried it on and used it for Pilates but after the first wash the stitching began to unravel. It’s quite severe I’m not sure what to do with it but it does look really good and is quite functional for those kinds of workouts.

Oh no! This should not be happening. I am from the Customer Love Team and I have sent you a private email so I can help make things right. - Emman

S
Sabrina
Height: 5'8" FT (173 cm)
How does it fit?:
Runs Small
Runs Big
Bra Size: 38C
Size Bought: L
Normally Wears: L
Body Type: Hourglass
Too low cut on long torsos

LONG TORSO GIRLIES BEWARE popflex pieces with jumpsuits/one piece bases don't suit long torsos

I want to love this so much but unfortunately doesn't cover my nipples... The fit of everything else is great, but the torso is just too short for my body, making it uncomfortable on my boobs. Otherwise it'd be perfect :( I should have seen this coming with the fit of the the pirouette dress I got last time which was a bit uncomfortable on my boobs because it was pulling them down from the torso being too short... at least that one I could make the shoulder straps shorter. These are non-adjustable.

A
Aisha H.
Bra Size: 34G
Size Bought: M
Body Type: Hourglass
Love the fit

Love how it fits but the stitching is coming undone already after 1 wash. I brought the other colour and the short versions in both colours at the same time and they haven’t had this problem which is surprising since I’ve only worn this black one twice.

R
Rach
Bra Size: 36C
Size Bought: M
Body Type: Pear
Cute but has issues

I'm a beginner figure skater, not very flexible or doing anything crazy... I have worn this jumpsuit to two skating sessions and the stitching up the backside is already coming apart. I ordered according to the size chart (midflex) and the piece seemed to fit very comfortably, but I see a hole has torn in the crotch area and the rear stitching has unraveled. I haven't even washed it yet. I won't be wearing it again now that it has a hole that will only get bigger. I don't know if this is an issue with the design of that area pulling in the wrong places or if it's an issue with the quality of stitching, but at this price point I'm very disappointed. I have a cheap amazon jumpsuit that fits poorly and is too tight for me in the rear, and yet I have not had the same problem with that piece. I like other things about the way this Popflex jumpsuit is designed so I still gave it two stars; it looks very flattering, has a cute neckline and the chest area felt secure. As a tall, curvy woman it's hard for me to get the proportions right on pieces like this- I was excited to invest in what I thought was a high-quality jumpsuit so it would be more flattering and last longer. And it looked so cute on too!! But I can't wear it anymore so I definitely regret buying it. If this quality issue is a fluke and not a problem across the board I would love to be proven wrong.

N
Nina W.
Bra Size: 32G
Size Bought: M
Body Type: Hourglass
Beautiful quality and flattering fit, but not quite gym-friendly for larger busts

Let me start by saying that I’m a huge PopFlex fan — I’ve bought several items before and will continue to do so in the future. I’ve been super pleased with the quality every time, and this onesie is no exception. It’s extremely comfortable, very flattering, and the fabric is just as soft and well-made as I hoped.

That being said, I purchased this hoping it would work for the gym, and unfortunately, the fit in the bust area doesn’t provide enough coverage for me personally. I previously bought the Go With The Flow jumpsuit in a medium and it fit perfectly all over — including my chest. So I was really excited for this onesie, thinking it would offer the same level of coverage and support. But even though the material is stretchy and there’s an inner bra shelf, it just sits too low on me. I have a fairly small ribcage with a slightly fuller bust, and unless I want serious cleavage, I can’t quite make it work.

While I’m not shy — I wear sports bras as tops to the gym all the time — this feels a bit too revealing and not secure enough for workouts. If I lean over, I feel like I’d be spilling out of it, and that’s not something I’m comfortable with at the gym.

That said, this is still a gorgeous piece and super comfy for lounging at home. If you have a smaller chest or you’re looking for something more casual, it would probably be perfect. But for me, it’s not quite squat-proof up top. Not every item can be a 5-star win every time — so for now, I’ll wear this one at home and admire my cute, sporty look off-duty!

N
Nicole E.
So Flattering & Comfy

We need more colors! I love this bodysuit!

I
Ivy
Bra Size: 32D
Size Bought: S
Body Type: Athletic
NOT for big breasts & tiny waists

I wish they would show this on a model who's skinny and gifted in the chest cause all this outfit does for me is give me a uniboob. Not the attractive type. Fits great everywhere else but I don't like that it doesn't have pockets. I didn't think to check since I'm use to everything having pockets on this site. I will be returning this one.

A
Audrey S.
Size Bought: M
Body Type: Hourglass
Great for my recital

I needed this for a high heel dance recital, and it was super cute. I am tempted to adjust the straps because I was adjusting quite a few times throughout the day. Maybe in the future the straps can be adjustable.

Thank you for your feedback! We're glad to hear that our Be Flexible Seamless Onesie worked well for your recital. We appreciate your suggestion about adjustable straps and will definitely take it into consideration for future designs. Thank you for choosing our product!

I
Irie
Size Bought: L
Fits like a glove!

This one piece is super cute! I love the cut of the neckline and the way the bodysuit fits on me like a glove. Very stretchy material with tummy control. It is flattering and slimming! #popflexcreator

We're so glad to hear that you love it! Our team worked hard to create a piece that not only looks great, but also offers tummy control and a flattering fit. Thank you for your skills, vision and for being a #popflexcreator!

S
Sharon
Size Bought: XS
If you ever wanted to feel elegant like a dancer, this would be the onesie for you!

I never thought I'd be a fan of a onesie until I tried this one on! I love how the material hugs your body but it doesn't pinch or fold in any uncomfortable places. It feels so slimming and elongating (which is important for me as a 4'9"" shortie!), and it just gives me dancer vibes, which I love. The neckline is really cute and looks so good, and I love the open back.
The inseams for this one are too long for me, and in this case I just scrunch the extra fabric up at the bottom and hide them in my socks, but as always, I would LOVE a shorter inseam on these so that they could fit perfectly!
#tryoncrew"

Thank you for leaving such a lovely review! We're so happy to hear that you feel elegant and like a dancer in it! We're always striving to make our products comfortable and flattering for all body types, so we're glad to hear that it hugs your body in all the right places. We'll definitely take note of your feedback for a shorter inseam option. Thank you for being a part of our #tryoncrew! Keep on dancing in style! :)