
BLACKBIRD standard seat foam (Manufacturer reference: 4211S) — a foam designed for motocross and enduro practices, engineered to replace the original foam without altering geometry or height.
Made from high-quality closed-cell expanded polyurethane, this foam does not absorb water and retains its mechanical properties over time. Developed with the support of championship teams, it offers high longevity and resistance suited to the demands of the terrain: repeated impacts, vibrations, and intensive use on track or trail.
Ideal for refurbishing your seat on machines like the YAMAHA WR 250 F (RE25) or WR 450 F (RE45), this BLACKBIRD foam provides a reliable and straightforward solution to restore the original seating comfort and geometry without surprises. A practical choice for riders seeking a robust and durable replacement part.