30I Bras
What is a 30I in other brands?
324 bras tracked in 30I · 3 brands · See all I cup
Your 30I across brands
A 30I isn’t the same in every brand. Here’s how a standard US 30I translates across the brands we track — and how each one runs.
| Brand | How it runs | Your 30I → |
|---|---|---|
| ThirdLove | cups run generous | 30I |
| Wacoal | true to size | 30I |
| Panache | true to size | 30G |
| Bravissimo | true to size | 30G |
Editorial buying guide
Read →Read the 30I buying guide
Top picks, sister sizes, and how to spot a good 30I fit.
Sister sizes
Panache
Endurance Wired Sports Bra - Sienna Rose
$84.00
Panache
Bette Balcony Bikini Top - Teal Blue
$85.00
Fantasie
Lillia Balconette Bra: White
$86.00
Fantasie
Lillia Side Support Bra: White
$86.00
Fantasie
Magdalena Spacer Molded Bra: Vintage Green
$86.00
Fantasie
Magdalena Spacer Molded Bra: Noir
$86.00
Fantasie
Magdalena Spacer Molded Bra: Natural Beige
$86.00
Fantasie
Magdalena Balconette Bra: Vintage Green
$86.00
Fantasie
Magdalena Balconette Bra: Noir
$86.00
Fantasie
Portia Balconette Bra: Red
$88.00
Fantasie
Portia Side Support Bra: Red
$88.00
Panache
Endurance Wired Sports Bra - Black/Latte
$88.00
35% off
Panache
Lara Plunge Swimsuit - Aurora Red
$91.00$140.00
Panache
Iris Balcony Tankini Top - Black Gingham
$120.00
Panache
Isabella Balcony Swimsuit - Polka Dot Print
$125.00
Panache
Paloma Balcony Swimsuit - Red Gingham
$135.00
Panache
Paloma Balcony Swimsuit - Black Gingham
$135.00
Panache
Rita Plunge Swimsuit - Black
$137.00
Panache
Monica Balcony Swimsuit - Liliflora Print
$140.00
Panache
Monica Balcony Swimsuit - Teal Blue
$148.00
Panache
Lara Plunge Swimsuit - Aurora Black/White
$148.00
Panache
Rita Plunge Swimsuit - Cobalt
$152.00
Panache
Rita Plunge Swimsuit - Red
$152.00
Panache
Gigi Balcony Swimsuit - Sparkle Teal
$155.00