mfi md neckwarmer. the anon mfi® midweight neck warmer protects your face and neck from wind, sun, and cold with our exclusive magnetic connection that seals the face panel to any mfi-compatible anon goggles. versatile midweight fabric offers the perfect amount of warmth and breathability for any weather condition. the vent panel at the mouth ensures fog-free performance. the magnets in this neck warmer are easily removed for machine washing or when you choose to wear it with non-mfi goggles.