Frequently Asked Questions
Everything you need to know about your next favorite swimwear.
How do I find my perfect size?
We recommend checking our detailed Size Guide located on each product page. Our suits are designed with high-stretch Italian lycra, but if you are between sizes, we suggest sizing up for the most comfortable fit.
What is your return policy?
We offer returns or exchanges within 30 days of delivery. Items must be in original condition with all tags and hygiene liners intact. Please note that for hygiene reasons, we cannot accept returns if the liner has been removed.
How should I care for my Sienna Swim pieces?
To maintain the vibrant color and elasticity, we recommend hand washing your swimwear in cold water with mild detergent. Always air dry in the shade and avoid rough surfaces to prevent snagging.
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.
Do you offer international shipping?
Yes, we ship to over 50 countries worldwide. Shipping costs and estimated delivery times will be calculated at checkout based on your specific location and local customs regulations.
What sustainable practices do you follow?
Sienna Swim is committed to the planet. 80% of our collection is made from regenerated nylon (ECONYL®) sourced from ocean waste, and all orders are shipped in 100% compostable packaging.