- For Next Day Delivery, please place your order before 1pm GMT (Monday-Thursday) to receive it on the next business day.

- For Standard Delivery, shipping will take 2-3 business days 

- For non-mainland UK addresses, please allow up to 5 business days to receive your order 

**Shipping times may be affected by busy sales periods such as the holiday season.

All of our styles fit true to size. On each product page there is a size guide which we would recommend taking a look before making your choice.

We are based in the UK but offer international shipping to Belgium, Denmark, France, Germany, Ireland, Italy, Netherlands, Portugal, Spain, Sweden, Switzerland, USA, South Africa, Australia and Canada.

- EU: Standard Shipping £10 (3 - 5 days) / Express Shipping £23 (2 - 7 days)
- US: Standard Shipping £11.5 (5 - 7 days) / Express Shipping £25 (2 - 10 days)
- AUSTRALIA: Standard Shipping £13 (5 - 10 days) / Express Shipping £37 (2 - 10 days)
- CANADA: Standard Shipping £11 (5 - 7 days) / Express Shipping £30 (2 - 10 days)
- SWITZERLAND: Standard Shipping £13 (5 - 7 days) / Express Shipping £30 (2 - 7 days)
- SWEDEN: Standard Shipping £8.50 (5 - 7 days) / Express Shipping £24 (2 - 7 days)
- SOUTH AFRICA: Express Shipping Only £35 (2 - 7 days)

Items shipped outside the UK may be subject to import duties and taxes applicable to your country or country you are shipping to. Customers are solely responsible and liable for any duties or VAT that are specific to their country. We recommended that you contact your local customs office for further information.

For international orders outside of the UK, please note that we do not currently accept returns.

All major credit cards and payment methods are accepted, including Mastercard, Visa, American Express and Klarna.

Of course, you can either text us on +447888300084 or get in touch via team@theunderdays.com

We understand that you might change your mind, it’s not the right size or style for you and we are happy to accept returns of items based on the conditions outlined below.

- You have 21 days from the date your order is despatched to return your order for a full refund and 30 days to receive an exchange or store credit.

- We expect to receive your order in the same condition it was delivered in, with hygiene sticker intact and swing tag attached. The item must be unworn and unwashed.

- We reserve the right to adjust your return method if your return arrives in a condition that does not comply with our returns policy.

- Please allow up to 14 business days for a return or exchange to be processed once it arrives at our warehouse and is inspected. You will receive an email from us when the return or exchange is processed.

- Items purchased in seasonal sales (using a promotional code or discount) and complimentary items are not eligible for returns.

We have made returns easier thanks to our online returns portal, please email us at team@theunderdays.com to begin the return process. All you will need is your Order number and Postcode. You will find your order number in your Underdays Order Confirmation email. 

Please review our returns policy before submitting a return.

And please note, we reserve the right to adjust your return method if your return arrives in a condition that does not comply with our returns policy.

We recommend washing all our underwear on a cool wash, maximum 40 degrees. 

Air-dry flat in shade. Do not iron or tumble dry.

We’re not perfect but we’re working on it. Click here to read more about our sustainability plans.