The Havnby code we list is THEGREENES, a creator code from The Greenes Go Wild YouTube channel. It does not appear on Havnby's own pages, but it took 10% off in Havnby's cart on 2 October 2026.
In the cart it took 10% off all three mattresses: FlatCore Hybrid Support $549 → $494.10, CloudCore $399 → $359.10, FlatCore for Model Y L $699 → $629.10.
Read the FlatCore reviewCloudCore reviewAdd your mattress to the basket at havnby.com, paste THEGREENES into the discount field at checkout, and confirm the 10% deduction shows before paying.
Havnby shows no public code on its own site. If THEGREENES stops working, this page will be updated. All codes for every brand live on the codes page.