High waisted bikini bottoms that smooth your tummy, stay put in the surf and don't roll down.
"These are great and come up high enough that they dont roll down under my tummy ( even when you get dumped in a wave!)."
| 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 Byron Bikini Bottom work
A high rise and a mesh panel smooth your tummy and hold everything in.
Enough bum coverage to feel secure, and no riding up when you swim.
Soft, thick and no see-through surprises when it's wet.
Pair with the Byron Bikini Top or Coolum Tankini, sized separately so each half fits.
What women ask us most about the Byron Bikini Bottom.
Byron High Waisted Bikini Bottom comes in sizes 8 to 26. If you're between sizes, go down. It's sold separately from the tops, so choose the size that fits your bottom half.
It's a high rise that sits over your tummy, so it won't roll down, even when a wave dumps you.
Yes. A mesh panel through the front smooths your tummy without squeezing.
Enough to feel secure. Not too skimpy, not too frumpy, and it stays put when you swim.
No. It's double lined.
The Byron Bikini Top or the Coolum Tankini, sold separately.
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.
★★★★★ 4.8 from 270 reviews
First Bikini in 30 years!
"I have a bit of a double tummy so I loved that the bottoms were actually high wasted enough to cover my belly bulge above my belly button! Thank you!"
So comfy!
"The most comfortable swim bottoms ever!!! They stay in place, don't ride up anywhere and have the softest waistband which sits perfectly. I now have 3 pairs!"
Best swim bottoms ever
"Super comfy bottoms with good bum coverage and a waist that fits in all the right spots"
Overall rating: 4.8074074 / 5 from 270 reviews.
The Byron High Waisted Bikini Bottoms are praised for their supportive fit, tummy control, and flattering high-rise waistline. Customers appreciate the excellent quality, fabric, and coverage, making them a comfortable and stylish choice for beach and pool wear.
Review topics: ["feel","fit","coverage","colour","quality","fabric","material","bottom","size","look","cut","bikini","waist","style","texture","swimwear","height","comfort","stretch","piece","shape","swimmers","waistband","bathers","support","top","rise","brand","tummy","set"].
"I am enjoying my comfortable, no crease, easy wash, quick dry gear from Active Truth. Just back from Europe where I felt comfortable & well dressed in comfy tops & pants. My swimmers have arrived & the girls at Aquarobics are envious. These garments are timeless & coordinate well with my existing wardrobe."
"These are great and come up high enough that they dont roll down under my tummy ( even when you get dumped in a wave!). I can mix and match with my tops too giving me more choice in my cossies. Think I might get another one - just in case."
"Happy that I could wear these bottoms with the tankini to look like a one-piece swimsuit. I have a long torso and find one-pieces don’t fit well."
"Great coverage, fantastic fabric and fit. Exactly what I hoped for. Suggestion to go down one size was spot on."
"Love these so much, the only issue is the straps twist alot when wearing. otherwise i love them"
"Yes they are lovely but run a little big l would size down next time l buy ."
"Great coverage and high waisted fit. So well designed to be flattering and comfortable."
"Comfy and good coverage, but I think I still prefer their one pieces more."
"Very comfortable. Pants on the bigger side but sit well on the body."
"Look great!! Soft fabric!! My first bikini EVER!! And don’t regret it!!"
