Designed for ultimate fuller-bust support and all-day comfort, this halter neck bikini top blends timeless elegance with modern femininity. Underwired and fully lined with our signature Core Swim Lining, it delivers exceptional lift, shape, and support. Finished with a contrasting golden metal clasp, it’s a chic, sophisticated swimwear essential that exudes pure elegance.

Why you’ll love it: 

•    Game-Changing Support – Thanks to our unique Core Swim Lining, an ultra-thin inner layer that delivers invisible yet powerful fuller-bust support—even when wet. Enjoy perfect lift, shape, and stability, with the confidence to move freely knowing your bikini won’t let you down (yes, we tested it playing volleyball!).

•    All Day Comfort – Engineered to provide real fuller bust support through the back band and the cups so the neck straps don’t need to take the strain.

•    Bra Sized – Tailored in proper cup sizes for flawless coverage and a secure fit

•    Luxurious Quality – Crafted from premium Italian eco-friendly swim fabrics with superior shape retention, UV protection, and resistance to chlorine and swim lotions. Finished with specialised swimwear 24-carat gold-plated trims for an elevated touch.

•    Exclusivity – Each Core Swim piece is part of a small, limited-edition collection, ethically and sustainably made in the EU. Never mass produced. 

•    Elegance – Timeless, fuller-bust–flattering designs in sophisticated block colourways, made to be styled as individually as you are.

Core Swim Lining
The secret to our unrivalled support. This ultra-thin, quick-drying fabric reinforces naturally stretchy swimwear material, which on its own struggles to support fuller busts—especially when wet. It creates an invisible inner structure that lifts, shapes, and secures, so you can move with confidence knowing your bikini won’t let you down. No sagging, no loss of support, even after a swim—just effortless stability and all-day comfort. Truly game changing.

Sizing & Fit: 
The DD+ halter neck bikini style is designed to provide full coverage, so it may feel a little generous in the cup. If you’re between sizes, we recommend choosing the smaller size for the best fit. The back band should feel snug to create anchorage, support, and stability—helping you avoid slippage and awkward public readjustments.
For more details, please see our fitting guide or contact us—we’re always happy to help with sizing advice.

The key to your bikini doing what it has been designed to do is the fit. If it doesn't fit you properly, it won't support you properly.

The Core Bikini Top:

1. Back size:

The Core bikini top has been designed to be as close as possible to your bra size so you should order your standard back bra size (e.g. 36). Please note that the Core bikini has been designed to fit snuggly on your back size. We do not mean tight (that would be uncomfortable) but we do mean snug. The reason for this is:

1. A lot of the support from the bikini (and your every day bra) comes from the back. If the back is too big, you will lose support

2. Although the Core Swim bikini is fully lined (including the wings) to minimise stretch and maximise support when wet, we want you to be just as confident in your wet bikini as your dry bikini so we've designed it snug (again not tight!) so there is no need for those public adjustments when you get out of the pool.

Advice: If your bikini arrives and the back is not snug, consider a smaller size as you may get a better support. If it is too tight, please consider the next size up.

Note that if you size your back size up or down, you will also need to change your cup size to reflect this (it's called "sister sizing", see below).

2. Bikini cup size:

This is a sister sizing bra size chart and shows you the size you need to adjust to depending on the individual fit issue. For example, if you had a 36FF and the back was too tight but the cup fit, you would go up a back size and down a cup size to a 38F. Or, if the 36FF was too big on the back but fine in the cup, you would go down a back size and up a cup size to a 34G (see black arrows):

If the back fit you perfectly but the cup feels big then just go down a cup size to a 36F. Or, if the cup is not covering you as much as you would like or there is bulging, then go up a cup size to a 36G (see the red arrows).

 International Size Conversions:

Delivery Charges to UK

• Delivery is free for orders over £125
• The delivery fee for orders under £125 is £4.95 
• We use Royal Mail Tracked delivery service which will usually arrive within 2-3 business days from date of dispatch
  
• We do not currently offer next day delivery service
• We aim to dispatch orders within 3 working days. During busy promotional periods it may take longer to dispatch your order

Returns Policy

• We want you to be completely happy with your Core Swim purchase but if you want to return it for any reason, then you can return it within 14 days of the date of delivery for a full refund (excluding any delivery charges)
• To start a return please sign into your account or follow this link Click here to start a return
• You must notify us of your intention to return within 14 days of receiving the item
• Once your return request has been confirmed, you have 14 days to return the item to us
• Returned items must be unused and unworn with hygiene stickers and security swing tags intact on the garments. Items we cannot resell due to damage whilst in your possession will not be refunded. Please return them in the same condition you would expect to receive them (be mindful of make-up, deodorant etc)
• The cost of return is at your own expense and will not be refunded unless the item is faulty
• Please retain a proof of postage with reference as we will be unable to issue a refund for goods that do not arrive back to us
• Once we receive your return we will issue a refund via the original payment method
• If you are returning items that received free shipping, a £4.95 charge will be deducted from your refund to cover the cost of the free shipping
• Your refund will be processed within 5 working days
  
• Click here to start a return

Exchanges

• If you would like to return any items for an exchange then please email us at sales@coreswim.co.uk or click reply on your order confirmation email
• Please quote your order number, details of the items you are returning and details of the items you wish to exchange them for
• We will check stock and confirm availability via email
• You must notify us of your intention to return/exchange within 14 days of receiving your order (as per the above returns policy)
• We must receive the returned items within 14 days of us confirming the exchange
• The cost of return is at your own expense. Please retain a proof of postage with reference as we will be unable to issue a refund or exchange for goods that do not arrive back to us
• Once received we will processs the exchange. If the cost of your exchanged items is less than your original items then we will refund the difference via your original payment method
• We offer FREE DELIVERY on exchanges (one per order)
• This exchange policy only does not apply to items on sale or promotion 

Faulty Products

• Our products have been made by highly skilled seamstresses using only high quality materials and they have been put through rigorous quality control procedures
• We expect them to arrive with you in perfect condition and if cared for according to our care advice, to last you a long time.
• In the event that your product arrives faulty please contact us to arrange a return and refund
• In the event that your product develops a manufacturing fault after use, please contact us to discuss and to arrange a return. Please note that normal wear and tear is not considered a fault and we would expect that the garments had been cared for according to the care label instructions