PURPOSE: To obtain a solid cotton having excellent flame-retardancy, heat- resistance and cushioning property by mixing aromatic polyamide short fibers with polyphenylene sulfide short fibers and bonding the fibers with each other by melting the polyphenylene sulfide short fibers.

CONSTITUTION: Aromatic polyamide short fibers 1 are mixed with preferably 1-30wt.% of polyphenylene sulfide short fibers and the mixture is heated at a temperature higher than the melting point of the polyphenylene sulfide short fiber and lower than the melting point of the aromatic polyamide short fiber to form the bonding points 3, 4, 5 between the fibers by the melting of the polyphenylene sulfide short fibers and obtain the objective solid cotton especially suitable as a cushioning material of aircraft seat, wadding of a coverlet for a foot warmer, etc.