"A curable composition essentially consisting of certain alkoxysilane compounds and at least one compound represented by the formula ##STR1## wherein R5 is a lower alkylene group, R6 is a lower alkyl group, n is an integer of 2 - 20, and m is an integer of 4 - 20, forms an excellent anti-fogging abrasion resistant coating on the surface of inorganic and organic transparent or mirror materials." . . . . .