- Orders usually leave our warehouse within 2 -3 business days. Sales and promotional periods can bring small delays, since order volumes rise.

- Standard shipping typically arrives in 3 - 5 business days.

- Express orders are the quickest option, so check the delivery estimate shown at checkout.

Pre-orders: When a pre-order item is part of your purchase, everything ships in one parcel as soon as that item is in stock.

**Delivery times can stretch during busy periods such as the holidays.

Yes, just write to us at contact@theunderdaysunderwear.com.

Let us know about any corrections quickly. We will try our best to update your order, but once the parcel has been sent out, it can no longer be changed.

Yes. Besides the United States, we ship to many other countries around the world.

United States: 

Standard $8.00 / Free on orders of $70 or more

Express $15.00

Rest of the world:

Standard $8.00 / Free on orders of $200 or more

Express $15.00

Parcels sent outside the US can be charged import duties and taxes by the destination country. Any such taxes and duties are worked out at checkout. Buyers are responsible for duties or VAT required in their own country. For more details, we suggest asking your local customs office.

No, each order accepts a single discount code.

Returns are welcome under the conditions listed here.

- Returns are accepted for 30 days after your order is dispatched, and you can choose a refund, an exchange or store credit.

- Items must come back exactly as they arrived, with the hygiene sticker still in place and the swing tag attached. They must be unworn and unwashed (deodorant marks included).

- If a return reaches us in a state that breaks these rules, we may change how it is handled.

- After your return or exchange reaches our warehouse and is checked, processing can take up to 14 business days. We will email you once it has been completed.

- Refunds for returned goods do not cover shipping costs.

- Black Friday sale purchases can still be returned or exchanged under the usual policy.

To start a return, go to our Returns Portal in the first 30 days after dispatch:

👉 theunderdays.loopreturns.com

Once 30 days have passed since dispatch, sales are final.

Free gifts cannot be returned.

No, a single promo code applies to each order.

An order containing pre-order products waits until those products are back in stock.

We take every major credit card and payment method, including Visa, Mastercard, American Express, PayPal, Apple Pay and Klarna.

Every style runs true to size. Each product page includes a size guide, and we suggest checking it before you decide.

Our advice is a cool wash at 40 degrees at most, with the pieces placed inside a garment bag.

• Let them dry flat, out of the sun.
• No ironing and no tumble drying.
• Group with similar colours when washing

We are still improving, though we have not got everything right yet. Click here to learn about our sustainability plans.

The Everyday Collection carries a HeiQ Skin Care™ finish, a Swiss synbiotic technology that looks after your skin's microbiome whenever fabric touches skin. Think of it as skincare you wear. This is a cosmetic treatment aimed at skin health and appearance; it is not a medical product and does not diagnose, treat, or prevent disease.

Not at all, it comes built in. HeiQ Skin Care™ is added to the fabric while it is made, so it starts working the first time you put them on. There are no creams, sprays, or extra steps to follow.

Handfeel, breathability, colour and fit stay the same, so it feels just like the Everyday you already know and love. It is non-irritant, patch tested on human skin, and every ingredient is INCI-listed.

It holds for as many as 40 washes. Use a gentle cycle at 30°C. Figures come from HeiQ and are based on tests carried out on other materials.

No. UNDERskin™ complements what you already do and does not take its place, so keep using your current products as well.