Love my green one piece
"Fits great gives support and flattering"
| 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 Top work

A shelf bra with power mesh lifts and shapes up to a G cup, with full bust coverage.

An adjustable under-bust band with a bra-style clasp, plus adjustable straps, so you can dial in the support.

No see-through surprises when it's wet.

Pair it with our Byron High Waisted Bikini Bottom, sized separately, so each half fits.
What women ask us most about the Byron Bikini Top.
Byron Bikini Top comes in sizes 8 to 26. It's sold separately from the bottoms, so choose the size that fits your top half.
Yes. A shelf bra with power mesh supports up to a G cup with no underwire. The under-bust band has a bra-style clasp and the straps adjust, so you can fine-tune the lift.
There are no cups sewn in, so you can add your own padding or inserts.
No. It's double lined.
Our Byron High Waisted Bikini Bottom, sold separately so you can pick a different size for each half.
Yes. There's space in the shelf bra to hold a breast prosthesis or breast form, and 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.
★★★★★ 4.8 from 160 reviews
Really comfortable and holds the girls up
"I love the colour and it's the first bikini top that provides support without a horrible underwire. I love the top."
Love them!
"I bought the Byron set and they are the perfect amount of coverage without looking like your wearing your grannies undies. I am usually a 12F cup anda size 10-12 and I bought the medium which for like a dream."
True to size, so comfortable
"True to size, so comfortable, good coverage. Stayed in place. . . Even at a waterpark!"
Overall rating: 4.85 / 5 from 160 reviews.
The Byron Adjustable Bikini Top in Navy Texture is praised for its high-quality, comfortable material and fabric, providing excellent coverage and support. Its adjustable fit and flattering cut make it suitable for various body types, while the beautiful deep teal color adds a stylish touch. Ideal for beach days and pool sessions, this bikini top is designed for lasting wear and confidence.
Review topics: ["feel","fit","fabric","colour","quality","coverage","material","top","cut","look","straps","support","texture","shape","design","bikini","size","band","clasp","bathers","style","shoulders","comfort","set","delivery","side","piece","bust","feature","boobs"].
"Fits great gives support and flattering"
"Great fit and lovely quality fabric."
"Solid coverage and I feel very held in place."
"Comfortable, good stretch and hold, can actually swim in it, and it looks good. I love it."
"So comfortable just the right support. Fabric is lovely."
"Love and so flattering around the bust."
"This bikini top is supportive & flattering, a joy to wear"
"Feels nice on"
"Great coverage, no side boob."
"Great fit and quality for both"