Click on the measuring tape icon on the product page to find a size chart.

Still unsure? Send a note to hello@neiwai.life and we'd be happy to help.

Most NEIWAI underwear is made from top-quality fabrics such as TENCEL™ Modal, Supima® cotton, and LYCRA® Spandex.

Click the "Materials & Care" tab on any product page for more information about that piece's specific fabrics.

Yes, all of our bras are wireless.

We recommend hand-washing your NEIWAI pieces in cold water with a gentle detergent. If you prefer to machine-wash, please set your washer to the delicate cycle and use a mesh laundry bag.

Please don't put your NEIWAI pieces in the dryer. Instead, hang or lay flat to dry in a cool, shady area.

Yes, please feel free to add your email to the NOTIFY ME WHEN AVAILABLE message to receive first hand inventory updates.

Once your order is ready to ship, we'll email you a shipping confirmation with your order number along with tracking information. You can also check your order status by visiting the Track Your Order page.

If you're unable to locate your shipping confirmation email, please check your spam/junk folder. If it still doesn't turn up, please send us a note to hello@neiwai.life for more assistance.

Orders can take up to 5 business days to ship and may be fulfilled from multiple US warehouses. If so, you will receive a separate tracking email for each shipment. Click here to view the tracking status of your shipment(s).

Please note: U.S. national holidays are not considered business days and can take an extra 1-2 days to be fulfilled.

Our fulfillment partners process orders quickly, so orders cannot be edited or cancelled once submitted.

Shipping, duties, and taxes will be calculated at checkout for Canadian orders. Duties and taxes are calculated on the original retail value of products, prior to any markdowns or promotions.

If you don't see an order confirmation email in your inbox, please check your junk/spam folder. If you're still not able to locate the order confirmation, please reach out to us at hello@neiwai.life.

Carriers often mark packages as delivered in advance, and actual delivery can take up to another 24-48 hours. If this happens, please reach out to us when you do not see your package after this delivery window.

A friendly neighbor may have accepted the package on your behalf for safekeeping. We also recommend double-checking all entrances and garages.

Please confirm your shipping address matches the address on your order confirmation.

If you still haven't seen your package after the above steps, please reach out to us at hello@neiwai.life.

We accept all major credit cards as well as additional payment options like Paypal, Apple Pay, and Shop Pay. A full list of accepted payment methods are detailed at checkout. We do not accept personal checks, cash, or money orders on our website.

Yes, we do! You can purchase an e-Gift card through our website.

Please note that e-Gift cards are Final Sale and are not eligible for additional promotions or discounts.

We do not support returns and exchanges for orders shipped outside of the United States.

NEIWAI partners with manufacturers that meet international standards to provide safe working conditions and a fair wage for all its employees.

Nearly all of our paper and plastic packaging materials are recyclable.

NEIWAI ships exclusively in packaging made using 40% fewer materials than those used by other leading fashion brands (and saving over 600 trees per year along the way). Our best-selling Barely Zero collection ships in boxes made from 100% post-consumer materials and is purposefully designed to be reused.

In addition to our initiative to reduce packaging waste, NEIWAI strives to be conscientious when sourcing the fabrics used in our collections. We choose only high-quality, eco-friendly materials from suppliers like PrimaLoft®, VITA, and Carbon Zero by TENCEL™.

We believe that cleaner production practices start at the source and will continue to work with top brands that share our commitment to a cleaner planet. Learn more about each of these organizations' sustainability initiatives on their websites.

We source fabrics from around the world with comfort in mind, working with leading partners like TENCEL™, Woolmark, LYCRA® and Supima. Many of our fabrics blend natural and synthetic fibers to enhance breathability, stretch, and durability. We use only OEKO-TEX® STANDARD 100-certified fabrics, meaning they have been rigorously tested and cleared for the intentional use of harmful substances like PFAS.