Introduction
Team USA’s track athletes at Paris 2024 wore ”biomechanical wool felt insoles” – a key factor in their 17% medal increase. Developed with MIT Sports Lab, this ”dynamic response felt” technology is reshaping athletic gear.

Performance Science
The patented ”3D-knit merino wool felt” matrix:

• Adapts to foot pressure 200x/second (vs. 4x for memory foam)
• Regulates microclimate at 0.05°C precision
• Returns 94% kinetic energy vs. EVA’s 67%

“Compressible wool felt layers act like micro-springs,” explains Dr. Kenji Tanaka, Nike’s lead biomechanist. Applications include: