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 policy?
We accept returns on unworn, unwashed items with all original tags and hygiene liners intact within 30 days of delivery. Please note that items marked as 'Final Sale' are not eligible for return or exchange.
Do you ship internationally?
Yes, ONEONE SWIMWEAR ships worldwide. Shipping costs and delivery times vary by destination and will be calculated at checkout. Please note that international orders may be subject to local customs duties and taxes.
How should I care for my ONEONE swimwear?
To keep your suit in top condition, we recommend hand washing in cold water with a mild detergent immediately after use. Avoid machine washing, tumble drying, or ironing, as these can damage the delicate fibers and elasticity.
When will my order ship?
Orders are typically processed and shipped within 1-2 business days. Once your package is on its way, you will receive a confirmation email with a tracking number to follow its journey.
What payment methods do you accept?
We accept all major credit cards (Visa, Mastercard, American Express), PayPal, and shop-now-pay-later options like Afterpay and Klarna for a seamless shopping experience.