Runsie Romper - Peachy Rose


Color: Peachy Rose
Deep Navy
Size Guide

This all-in-onesie features comfy wide crisscross straps, a peek-a-boo keyhole boob sweat vent, and a waist-snatching waistband with flowy run shorts, complete with built-in matching underwear so you can move with confidence. 

Perfect for jogging, walking, hiking, and weightlifting.

Performance Level:

Features + Fit

• Wide crisscross straps
• Keyhole boob sweat vent
• Removable pads
• Built-in underwear
• Outer leg slits to allow full range of motion
• Inseam: 1.75“ (4.5 cm)

Model Info

Melanie is wearing size XS
Height: 5’5" • Bra Size:32C • Waist: 25 • Hip: 34 • Torso: 60.5"

Katie is wearing size S
Height: 5’6” • Bust: 34” • Bra: 34A • Waist:26” • Hips: 37” • Torso: 59"

Arlene is wearing size 1X
Height: 5’9” • Bust: 44” • Bra 38DD • Waist: 37 ” • Hips: 48 ½” • Torso: 69"

Model Info
Model: Melanie Height: 5.5" Bra: 32C Waist: 25" Hips: 34" Torso: 60.5" Melanie is wearing size XS
Model: Arlene Height: 5.9" Bust: 44" Bra: 38DD Waist: 37" Hips: 48 ½" Torso: 69" Arlene is wearing size 1X
Model: Katie Height: 5.6" Bust: 34" Bra: 34A Waist: 26" Hips: 37" Torso: 59" Katie is wearing size S
Fabric + Care

Top: Brushed ButterSoft Flex
75% Nylon + 25% Spandex

Shorts: 100% recycled polyester; stretch woven fabric

Customer Reviews

Based on 63 reviews
Size Bought: XS
Overall Fit: True to Size
Height: 173
Bra Size: 75B
Body Type: Athletic
Weight: 52 kg

This is the cutest romper I have even seen and it’s so comfortable! I had very low expectations to be honest, as it was my first ever order from this brand and I didn’t expect random YouTube blogger to make some masterpieces as it was presented hehe ( I don’t use SM, so I never heard about this designer, and you know how it is sometimes when you order something online) ! But I was wrong, she did a great job and this is sooo comfy to wear and looks so beautiful 😻 many thanks ;) I was so impressed I even ask husband to make pics so I can add it to review ( also never write reviews lol, but this brand is so cute!)

Size Bought: M
Overall Fit: True to Size
Height: 5’8
Bra Size: 34D
Body Type: Hourglass
Weight: 140
So Cute!

This romper is great!!!! Fits really well and is super cute! I bought it in both colors but ended up returning the white one. I loved the style but I felt like you could see the padding a little bit with the lighter color. The navy one is perfect! I’ll buy any other dark colored ones you make!
I don’t think this would give me enough support to run in, but it’s great for running errands, walking or hiking. I think it would do well in pilates or yoga too!
For reference, I’m 5’8 about 140lbs and 34D and I bought a size medium. All of my onesies from Popflex are medium, but I do wear smalls in all of my leggings and shirts/bras from them. With my height I need the slightly bigger size.

Size Bought: M
Overall Fit: True to Size
Height: 5'6"
Bra Size: 36C
Body Type: Hourglass
Weight: 143

I LOVE this romper, it's so unique and stylish, I'm so glad I got it! It's almost short YouTube review tells alI! I recommend wearing a sports bra underneath for high impact exercise. Looking forward to trying more by Popflex! YouTube video placeholder
Size Bought: M
Overall Fit: True to Size
Height: 5"3'
Bra Size: 34B
Body Type: Athletic
Weight: 120 lbs

This romper is so cute. The built in bra and underwear allow for a seamless fit. The criss cross design and front keyhole is flattering. The only thing i wish it had was a zippler pocket to store a phone or snacks when not using a bag otherwise it's stretchy, sweat wicking, and comfortable. Perfect for a hike!

Size Bought: S
Overall Fit: Small
Height: 5’3
Bra Size: 32a/ xs
Body Type: Pear
Weight: 131
Adorable but doesn’t suit my body

I love that Cassey always thinks outside of the box and creates such cute designs with amazing patterns. I had to get this runsie because it was so unique and cute.
I started off feeling so cute and confident in the runsie. However, I noticed the whole thing is VERY short. My lower body is larger than my upper body so I chose the size that fit my lower body. Due to this fact, the chest part did not feel as secure as I’d like it to. The small key hole gaped a bit. I love the cream color with the pattern but the suede made it feel a bit hot, I almost wish it was the same fabric as the underwear beneath the shorts. Also being so light colored, it was easy to see the padding under the fabric which felt bumpy.

As I started my workout with a run, I noticed just how short it was. Because everything is connected I couldn’t adjust really. I became a little self conscious as I realized my whole bottom was being exposed with every stride because it is more free flowing.

After my run I did exercises with dumbbells. It became really uncomfortable bending and just moving more as I felt I was constantly trying to adjust the fit. Unfortunately, by the end of the workout I was not as confident. I also noticed the suede-like material on the top was too easily dirtied. I had some black marks in the chest despite being careful.

I think this would suit someone who has the same size top and bottom and who would use it for light movement or working out at home. It’s hard to run outside or on a treadmill with a lot of people around you as it can be quite revealing on some bodies.
I live the design still but I’d like it to be more coverage or adjustable if possible. It’s beautiful but just not for my body.