Welcome to the Underdays Circle

Our affiliate programme built for creators who genuinely love what they wear.

At Underdays, we believe wellness starts with what you wear closest to your skin. We're building a community of creators who share that belief, and want to build something real with us. The Underdays Circle is our affiliate programme. Join and earn commission on every sale you drive, while getting early access to launches, community support, and a clear path to paid partnerships.

How To Get Started

STEP 1

Claim your welcome code

Once you join, you'll receive a personal welcome gift code giving you 20% off any item across the Underdays site — our way of making sure you actually get to try the product you'll be sharing with your audience. Not sure where to start? We'd recommend one of our most-worn everyday styles: • The Everyday Thong • The Everyday Brief • The Everyday Cheeky All available in any colour. But the choice is yours. Head to the site, choose your style and size, and apply your code at checkout for 20% off.
Step 2

Wear it and post

Once your order arrives, share an honest post with your audience — showing how you actually wear it. That's all we ask. No brief, no script. Just you in your Underdays.
STEP 3

Receive your welcome gift

Once we've seen your post, we'll send you a physical welcome gift — a starter kit containing three pairs of Underdays and a scuba pouch. No chasing, no forms — we'll reach out directly. This is our way of saying thank you for showing up first.
STEP 4

Share and earn

Your unique affiliate link lives in your ShopMy or LTK dashboard. Share it alongside your discount code and earn 10% commission on every sale your audience makes — tracked automatically.
STEP 5

Grow with us

The more you post and sell, the more you unlock. Higher commission rates, early access to launches, event invites, and paid content opportunities await our top creators.

The Tiers

Standard

Commission:

10%


Threshold:

Any sales


Highlights:

20% off welcome gift code, Starter Kit on first post, WhatsApp community, monthly best-practices email

Top Performer

Commission:

12%


Threshold:

£2,000+ / quarter


Highlights:

Quarterly breakfast, early access to launches, performance feedback

Hero

Commission:

15%


Threshold:

£5,000+ / quarter


Highlights:

Paid UGC pipeline, brand & event input, founder dinners

Ready to join?

We work across two platforms. Choose the one that's right for you, or join both.

Join on ShopMy Join on LTK

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