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Jackson 4 Swim Onesie

Our iconic tie-back one-piece swimsuit

$78.00
$19.99
Select: Solids or Prints
Color: Ocean Friends
Size: 30
Size Chart

One Piece Swimsuit
Size Guide

Torso measurement is most important for finding your accurate one piece size.

If you are in between torso measurements or know your torso runs long we recommend sizing up!

  • JOLYN One Piece
    Size
    • 22 / 22J
    24J
    24
    26
    28
    30
    32
    34
    36
    38
    40
    42
    44
  • Dress Size
    (US)
  • Y10
  • Y12
  • 00
  • 0 | 2
  • 2 | 4
  • 4 | 6
  • 6 | 8
  • 8 | 10
  • 10 | 12
  • 12 | 14
  • 14 | 16
  • Torso
    (in)
  • 51
  • 53
  • 56
  • 57
  • 58.5
  • 60
  • 61.5
  • 63
  • 64.5
  • 66
  • 67.5
  • 69
  • 70.5
  • Cup Size
    (in)
  • AA
  • A
  • B
  • C
  • C
  • C | D
  • Waist
    (in)
  • 23-24
  • 24-25
  • 23-24
  • 25-26
  • 27-28
  • 29-30
  • 31-32
  • 33-34
  • 35-36
  • 37-38
  • 39-40
  • 41-42
  • 43-44
  • Hip
    (in)
  • 30-32
  • 33-34
  • 33-34
  • 35-36
  • 37-38
  • 39-40
  • 41-42
  • 43-44
  • 45-46
  • 47-48
  • 49-50
  • 51-52
  • 53-54
  • Over Bust
    (in)
  • 27-28
  • 29-30
  • 29-30
  • 31-32
  • 33-34
  • 35-36
  • 37-38
  • 39-40
  • 41-42
  • 43-44
  • 45-46
  • 47-48
  • 49-50

Measurement Guide

Torso

The most important for finding your accurate one piece size

Measure from the top of your shoulder over the fullest part of your bust, through your legs and around, up your back to the starting point.

If you are in between torse measurements or know your torso runs long, we recommend sizing up!

Bust

Measure around the fullest part at the bust.

Waist

Measure around the smallest part of the waist.

Hips

Keep measuring tape parallel to the floor and measure around the fullest part of the hip.

Measurement Guide

Jolyn swimwear, a woman with measurement arrows and guide

Fit Questions?

If you want a second opinion or need help figuring out your size, reach out to us at contact@jolyn.com and we’ll sort you out!

Only 4 left in stock!
Free shipping on domestic orders $90+!

Why You'll Love it

The suit that changed the perception of performance swimsuits.

  • Made in the best compressive swimwear fabric
  • Our innovative adjustable tie-back design allows for both a secure and comfy fit
  • Comes in 15+ colors
  • Superior tightly knit and compressive fabric that won't stretch out compared to lower-cost competitors

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Features

  • High impact

    High impact

    Made for the highest level of activity

  • Foreverever Fabric

    Foreverever Fabric

    Our classic bestselling fabric loved by athletes for its durability

  • Medium-Full Coverage

    Medium-Full Coverage

    Rounds across the butt with a regular to high cut at the leg opening

  • UPF 50+

    UPF 50+

    Stay protected during long days in sun


As seen in

We take design seriously.

We take design seriously.

slide 2 of 4

1. Tie-back fastening system

Our iconic tie-back lets you create your perfect fit. Loosen when you want to take it easy, tighten when you're ready for the fast lane.

Foreverever swimwear fabric icon

Foreverever Fabric

Our cult favorite original performance fabric beloved by top tier athletes. Built for durable, reliable performance.

Best For
Training, high intensity activity
Chlorine Resistance
Chlorine proof
Stretch Level
Minimal stretch
Fit
Fits snug to reduce drag, recommend sizing up
Handfeel
Soft, sturdy, durable

The one piece swimsuit with over 1,000 Review star Review star Review star Review star Review star reviews

Review star Review star Review star Review star Review star

This is the most flattering and comfy practice suit I have ever bought!

Review star Review star Review star Review star Review star

Only swimsuit for training that doesn't rub! Game changer!

Review star Review star Review star Review star Review star

I get so many compliments and people asking where I buy my swimsuits. The quality is unmatched. I have some for many years and they still look brand new.

Review star Review star Review star Review star Review star

Tie back is cute and comfortable. Since I got my first JOLYN, no other company has compared to it.


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