Explore key developments on Cut in Half: Inside the Materials and Cushioning of New Balance's Slimmest Sneaker in this special report.

The sneaker industry spent nearly a decade selling stability through sheer bulk. Footwear brands competed on who could stack the highest column of supercritical foam beneath the calcaneus. That aesthetic bubble burst. Driven by a global embrace of 1970s sprinting flats, driving shoes, and low-profile boxing silhouettes, street style swung entirely toward ground-hugging minimalism.

For New Balance, this shift represented an existential design puzzle. The brand built its core identity around plush medial posts, dual-density midsoles, and orthopedic footbeds. Squeezing that heritage into a razor-thin chassis required reimagining the internal architecture from scratch. The 240L was engineered specifically to answer models like the Adidas Taekwondo and the Puma Speedcat. Rather than hiding complex plastic shanks inside multi-piece tooling, the shoe relies on a simplified single-density carrier that brings the wearer’s foot down to street level.