Frequently Asked Questions
Everything you need to know about your next favorite bikini.
How do I know which size to order?
We recommend checking our detailed Size Guide located on each product page. Our suits are designed with high-quality Italian fabrics that offer a snug, supportive fit. If you are between sizes, we generally suggest sizing up for extra comfort.
What is your return and exchange policy?
We want you to love your ONEONE pieces. You can return or exchange unworn items with original tags and hygiene liners intact within 30 days of delivery. Please note that sale items are final sale.
How long will it take to receive my order?
Standard shipping typically takes 3-7 business days within the continental US. International shipping times vary by location, usually ranging from 7-14 business days. Expedited shipping options are available at checkout.
How should I care for my swimwear?
To keep your colors vibrant and the fabric elastic, always hand wash your bikini in cold water with a mild detergent after use. Avoid machine washing, tumble drying, or ironing. Dry flat in the shade.
Can I change or cancel my order after it has been placed?
Our team works fast to get your order to you! Once an order is placed, we have a very small window to make changes. Please contact our support team immediately via live chat or email to request any modifications.
Do you ship internationally?
Yes, we ship to most countries worldwide. Please be aware that international orders may be subject to local import duties and taxes, which are the responsibility of the customer upon delivery.