Difference A section anti-mite breathable|B section moisture-proof and dirty A section 6cm hard=3cm imported 3E brown A section 8cm hard=5cm Imported 3E brown A section 10cm hard=7cm imported 3E brown A section 10cm hard = 7cm imported 3E brown A section 10cm hard = 7cm imported 3E Brown A section 10cm hard = 7cm imported 3E brown A section