The Billie Eilish x Nike Air Alpha Force 88 comes constructed with a full leather build with ribbed collars, signature mid-foot strap and ‘AAF88‘ branding on the tongues, while co-branded insoles complete the design. As seen on previous collabs of the singer with Nike, the pair uses repurposed materials: Synthetic leather and textile are being used on the upper, while recycled TPU can be found on the forefoot strap, recycled polyester on the liner, and algae ink was used to color the heel, midsole and tongue.