What are your shipping options?

We offer the following delivery methods: Standard Delivery: $8 (free over $75) Express Delivery: $28

How long will it take to ship?

We aim to fulfil your order within 1 -2 business days. During peak periods or sales, processing times may take a little longer. Standard Delivery: 3 - 5 business days Express Delivery: 1 - 2 business days Please note transit times are estimates and not guaranteed. **Shipping times may be affected by busy sales periods such as the holiday season.

If I’ve made a mistake with my order is there anyone I can contact?

Of course, please get in touch via team@theunderdays.com . Please notify us of any changes as soon as possible. We’ll do our best to accommodate your request, but we can’t guarantee changes can be made once your order is in processing. If your order has already been despatched, changes cannot be made.

Do you offer international shipping?

Yes, we do — please visit our UK website to ship to the UK, Australia, or Europe.

What are your international shipping prices?

Australia: Standard shipping £15 / Free over $250 (2 - 5 working days) Express shipping £24 (2 - 3 working days) France, Ireland, Netherlands: Standard shipping £9 / Free over 150EUR (2 - 5 working days) Express shipping £10 (2 - 3 working days) Denmark, Sweden, Italy: Standard shipping £9.50 / Free over 150EUR (2 - 5 working days) Express shipping £12 (2 - 3 working days)

Do I need to pay for customs and import duties?

No. All duties and taxes are included at checkout — there are no additional charges after placing your order.

Can I use two discounts codes at once?

No, only one discount code can be applied at one time.

What's your returns policy?

We accept returns on eligible items under the following conditions: You have 30 days from the dispatch date to request a refund, exchange, or store credit. Items must be unworn, unwashed , and returned in their original condition, with the hygiene sticker intact and swing tag attached . Items marked as Final Sale are not eligible for return. Refunds exclude original shipping charges. Please allow up to 14 business days from the date your return is received for it to be processed. We’ll notify you by email once your return or exchange is complete. If an item does not meet our return conditions, we reserve the right to amend the return outcome accordingly.

How do I return my order?

To initiate a return, please visit our US Returns Portal within 30 days of dispatch: 👉 theunderdays-us.loopreturns.com All sales are final 30 days after the dispatch date.

What if my order includes an item on pre-order?

Orders that include a pre-order item(s) will be held until the pre-order item is restocked. You’ll receive an email with the estimated despatch date once your pre-order is placed.

How do I know which size will fit me best?

All Underdays styles run true to size. Each product page includes a size guide — we recommend checking this before placing your order.

How do I wash my Underdays?

We recommend washing all our underwear on a cool wash, maximum 104°F and preferably in a garment bag. Air-dry flat in shade. Do not iron or tumble dry.

Is Underdays sustainable?

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

FAQs

We offer the following delivery methods:
Standard Delivery: $8 (free over $75)
Express Delivery: $28
We aim to fulfil your order within 1 -2 business days. During peak periods or sales, processing times may take a little longer.
Standard Delivery: 3 - 5 business days
Express Delivery: 1 - 2 business days
Please note transit times are estimates and not guaranteed.
**Shipping times may be affected by busy sales periods such as the holiday season.
Of course, please get in touch via team@theunderdays.com.
Please notify us of any changes as soon as possible. We’ll do our best to accommodate your request, but we can’t guarantee changes can be made once your order is in processing. If your order has already been despatched, changes cannot be made. 
Yes, we do — please visit our UK website to ship to the UK, Australia, or Europe.
Australia:
Standard shipping £15 / Free over $250 (2 - 5 working days)
Express shipping £24 (2 - 3 working days)
France, Ireland, Netherlands:
Standard shipping £9 / Free over 150EUR (2 - 5 working days)
Express shipping £10 (2 - 3 working days)
Denmark, Sweden, Italy:
Standard shipping £9.50 / Free over 150EUR (2 - 5 working days)
Express shipping £12 (2 - 3 working days)
No. All duties and taxes are included at checkout — there are no additional charges after placing your order.
No, only one discount code can be applied at one time.
We accept returns on eligible items under the following conditions:
- You have 30 days from the dispatch date to request a refund, exchange, or store credit.
- Items must be unworn, unwashed, and returned in their original condition, with the hygiene sticker intact and swing tag attached.
- Items marked as Final Sale are not eligible for return.
- Refunds exclude original shipping charges.
- Please allow up to 14 business days from the date your return is received for it to be processed. We’ll notify you by email once your return or exchange is complete.
- If an item does not meet our return conditions, we reserve the right to amend the return outcome accordingly.
To initiate a return, please visit our US Returns Portal within 30 days of dispatch:
👉 theunderdays-us.loopreturns.com
All sales are final 30 days after the dispatch date.
Orders that include a pre-order item(s) will be held until the pre-order item is restocked. You’ll receive an email with the estimated despatch date once your pre-order is placed.
All Underdays styles run true to size. Each product page includes a size guide— we recommend checking this before placing your order.
We recommend washing all our underwear on a cool wash, maximum 104°F and preferably in a garment bag.
- 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.