Slip on the Billie Eilish T-Shirt: Therefore I Am in neutral soft-style cotton — officially licensed Billie Eilish merchandise carrying the track-title lettering across a back-print layout.

Therefore I Am ran as a single from Billie's second album cycle, and this design mirrors the punchy, off-kilter register the track title kicks around. The back-print treatment gives the wordmark room to sit large without crowding the front.

Available in a neutral tone on soft-style cotton, unisex short-sleeve cut with a crew neck. Reads well layered under a hoodie or worn solo, with the print catching the light on the back for a straight fit that suits both catalogue collectors and casual fans.

• Rockoff officially licensed product
• Style: Unisex Short-Sleeve T-Shirt
• Design: Therefore I Am
• Design Features: Back Print
• Colour: Neutral
• Material: soft-style cotton
• Great for: pop tee rotation, Billie Eilish fan merch, back-print collectors, gig-day layering

Yes, all of our products are 100% genuine and officially licensed

Please refer to our size chart located above the buy button. It can also be found on the left-hand side of the screen on some devices. We recommend measuring an item you love and then comparing the measurements to the size chart.

Items in stock at our UK shop are dispatched in 1–2 working days. You'll see this under the Add to Bag button when you pick your size.

All other items come from our licensed partner's warehouse and are dispatched in about 5 working days (up to 10 at busy times).

UK delivery is Royal Mail Tracked, usually 2–4 working days after dispatch, and free on UK orders over £40. Delivery costs are shown at checkout.

All items are dispatched from the UK.