The swimsuit thousands of women love: lifts and supports without wire, sculpts your waist, and smooths all over.
"I was sceptical that these would support my F cup natural breasts but they do! ... Very comfortable, stretchy and supportive."
| S | M | L | XL | 2XL | 3XL | |
| Size Conversion | ||||||
| AU | 8-10 | 10-12 | 12-14 | 16-18 | 20-22 | 24-26 |
| US | 4-6 | 6-8 | 8-10 | 12-14 | 16-18 | 20-22 |
| Bust | ||||||
| CM | 87-93 | 93-99 | 99-105 | 106-114 | 115-123 | 124-130 |
| IN | 34-37 | 37-39 | 39-41 | 42-45 | 45-48 | 49-51 |
| Waist | ||||||
| CM | 67-73 | 73-79 | 79-85 | 86-94 | 95-103 | 104-112 |
| IN | 26-29 | 29-31 | 31-33 | 33-37 | 37-40 | 40-44 |
| Hips | ||||||
| CM | 97-103 | 103-109 | 109-115 | 116-124 | 125-133 | 134-142 |
| IN | 38-40 | 41-43 | 43-45 | 45-48 | 49-52 | 53-56 |
For leggings, the hip measurement is the most important for finding your perfect fit, especially if you're between sizes.
Hip: the widest part of your hips making sure the tape measure is even over your bum
Waist: your natural waistline above your belly button and below your rib cage
Bust: the fullest part of your bust at nipple level
Send your measurements to hello@activetruth.com for personalised advice from our fit experts.
| S | M | L | XL | 2XL | 3XL | |
| Size Conversion | ||||||
| AU | 8-10 | 10-12 | 12-14 | 16-18 | 20-22 | 24-26 |
| US | 4-6 | 6-8 | 8-10 | 12-14 | 16-18 | 20-22 |
| Bust | ||||||
| CM | 87-93 | 93-99 | 99-105 | 106-114 | 115-123 | 124-130 |
| IN | 34-37 | 37-39 | 39-41 | 42-45 | 45-48 | 49-51 |
| Waist | ||||||
| CM | 67-73 | 73-79 | 79-85 | 86-94 | 95-103 | 104-112 |
| IN | 26-29 | 29-31 | 31-33 | 33-37 | 37-40 | 40-44 |
| Hips | ||||||
| CM | 97-103 | 103-109 | 109-115 | 116-124 | 125-133 | 134-142 |
| IN | 38-40 | 41-43 | 43-45 | 45-48 | 49-52 | 53-56 |
For swimwear, measure your hips, waist and bust.
Our swimwear is made to fit up to an G cup. If you are between sizes we generally recommend you size down, unless you are above an E cup.
Hip: the widest part of your hips making sure the tape measure is even over your bum
Waist: your natural waistline above your belly button and below your rib cage
Bust: the fullest part of your bust at nipple level
Send your measurements to hello@activetruth.com for personalised advice from our fit experts.
| S | M | L | XL | 2XL | 3XL | |
| Size Conversion | ||||||
| AU | 8-10 | 10-12 | 12-14 | 16-18 | 20-22 | 24-26 |
| US | 4-6 | 6-8 | 8-10 | 12-14 | 16-18 | 20-22 |
| Bust | ||||||
| CM | 87-93 | 93-99 | 99-105 | 106-114 | 115-123 | 124-130 |
| IN | 34-37 | 37-39 | 39-41 | 42-45 | 45-48 | 49-51 |
| Waist | ||||||
| CM | 67-73 | 73-79 | 79-85 | 86-94 | 95-103 | 104-112 |
| IN | 26-29 | 29-31 | 31-33 | 33-37 | 37-40 | 40-44 |
| Hips | ||||||
| CM | 97-103 | 103-109 | 109-115 | 116-124 | 125-133 | 134-142 |
| IN | 38-40 | 41-43 | 43-45 | 45-48 | 49-52 | 53-56 |
For maternity leggings, the hip measurement is the most important for finding your perfect fit.
We've designed our pregnancy leggings with plenty of room for your growing bump, so don't use your waist measurement.
Hip: the widest part of your hips making sure the tape measure is even over your bum
Waist: your natural waistline above your belly button and below your rib cage
Bust: the fullest part of your bust at nipple level
Crops
Due to the changes your body experiences during breastfeeding, we recommend comparing your under bust measurement (where your bra band sits) to the sizing chart below.
Our nursing crops cater up to a DD cup. For larger cup sizes you may wish to size up.
| S | M | L | XL | 2XL | 3XL | |
| Underbust | ||||||
| CM | 74-80 | 80-86 | 86-92 | 93-99 | 99-106 | 106-112 |
| IN | 29-31 | 31-33 | 33-36 | 37-39 | 39-42 | 42-44 |
What makes the Coolum work
Supportive built-in shelf bra. No cups sewn in, so you can add your own padding.
Core support power mesh holds you in and smooths without squeezing.
Shorten or lengthen the straps so everything sits where it should.
Built for pool laps, aqua aerobics and long days in the Aussie sun.
What women ask us most about the Coolum.
Coolum fits true to size and comes in sizes 8 to 26. If you're between sizes, go down. The built-in shelf bra supports B to G cups, so you don't need to size up for a bigger bust.
Yes. The built-in shelf bra supports B to G cups with no underwire, and the adjustable straps let you fine-tune the lift.
There is an opening to add your own padding or inserts securely.
Yes. Core support power mesh through the front holds in your tummy and smooths without squeezing.
Moderate, mid-rise coverage. Not too skimpy, not too frumpy.
Coolum also comes in a Long Torso fit with 7.5cm of extra front body length.
Yes, lots of women wear it after a mastectomy. The built in shelf bra has pockets, so you can add your own padding, prosthesis or breast form. Plus there's no underwire to press on sensitive areas.
Yes. All Active Truth swimwear is made from chlorine-resistant fabric, so it's built for pool laps, aqua aerobics and regular swims.
Yes. All our swimwear is rated UV 50+.
We offer exchanges to help you find your perfect fit and accept returns for 30 days from the date of purchase. Returns for refunds are only available for items purchased at full price.
Items marked Final Sale can't be refunded, returned or exchanged. See our returns policy.
Yes. Shipping is free on orders over $200.
★★★★★ 4.9 from 3,653 reviews
Better than expected!
"This is the first time in some years I looked like I had shape in my swimwear and actually felt supported..."
I love my new swim
"So great for tummy control. After 3 babies you need to feel great again in swimwear. I bought a second pair once I received my first"
Best swimsuit ever
"This is the most comfortable swimsuit I have ever owned and I’m 65 so that’s a lot of swimsuits! ... stays in place when wearing it"
Real customers in their Coolum
Overall rating: 4.8998084 / 5 from 3653 reviews.
The Coolum Core Support One Piece Swimsuit is highly praised for its flattering fit, supportive design, and high-quality fabric. Customers appreciate its true-to-size fit, excellent support, and comfortable feel. The textured ribbed fabric and wider adjustable straps add to its appeal, making it a popular choice for those seeking stylish and supportive swimwear.
Review topics: ["feel","delivery","fit","issues","fabric","quality","look","colour","size","material","coverage","swimsuit","straps","style","cut","bathers","shape","texture","design","swimmers","comfort","padding","value","support","neckline","stretch","weather","piece","length","pattern"].
"Omg so flattering! The colour! The fit! I love the skinny straps and the shelf bra without the padding which always retains water! The material is gorgeous - not clingy at all! Slightly higher cut in the front than Im used to but not so much that it shows off too much. Definitely recommend!!"
"Bought two of these swimsuits in the $50 sale and already want more. Great fit for F cups! And high quality & sucky inny in all the right places. The bottom is slightly cheeky but I don’t mind as most swimsuits have too much coverage in that area. Love the ribbed texture fabric instead of the plain smooth. Just adds another element."
"I hate buying new swimsuits as I’m 74 and conscious that my body is no longer in the best of shape, but after reading the positive reviews from ladies of varying shapes and sizes, I ordered the Coolum Core Support One Piece. I am a size 12-14, so ordered the Large size and I am delighted to say the swimsuit fits perfectly and is very flattering. I havent washed now ordered the sarong to match."
"Hands down the VERY Best swimsuit I have ever worn, I fit into size XL and the size L, I am a size 14 in the taking shape brand if thats helps anyone else with sizing. They are the most comfortable swimsuit design I have ever worn, good bum coverage and not too high of a leg cut for modesty and good fit for a DD cup as well."
"I was a bit worried about this swimsuit as it didn’t have as big a cup range as the Coolum in the bust but I preferred the thicker straps… And I am glad I read the approve reviews and got it anyway. It fits really well, even with a larger bust. Very flattering cut and beautiful material!"
"I absolutely love the colour, style and fabrication of this swimwear. First time buyer and very impressed. I bought mine on sale. No concerns with my next purchase as this is a high quality product. I have a little tummy now that I am 60 but this swimsuit is extremely flattering!"
"I absolutely love my new cossie. The colour, cut and quality of the fabric are all outstanding and I will definitely be adding a few more to my beach wardrobe for this Summer. The fit is perfect- very flattering and not too high cut or skimpy. I got a medium but as I’m small chested, a small would’ve bee ok as well. Super comfy regardless !"
"I stumbled across this brand on social media, saw a bunch of my friends follow this brand and thought I’d purchase a new one-piece. Blown away! The quality is beautiful, supports in all the right places and actually covers my bottom! (I’m not the cheeky bottom kind lol). Will definitely purchase again. Love them!"
"Absolutely love this swimsuit! The fit is incredibly flattering, with just the right amount of support to make you feel comfortable and confident. The ruching around the tummy is particularly flattering, and the colour is even more beautiful in person. It’s stylish, comfortable and makes me feel fabulous. Highly recommend!"
"The style is very flattering to the bust and I love how it sucks the wobbly tummy in without being tight. The colours and fabric are stunning. I am self concious about showing bum cheek, so I would like more coverage in that area. The rest fitted perfectly. I am inbetween sizes so I sized down as advised on the website, and definately needed to."
