Abstract: A coupling element adapted to couple an accessory to a clothing item includes including an external surface and an internal surface surrounding an opening. The external surface is adapted to fixedly attach to the clothing item, and the opening and the internal surface are adapted to receive, engage and detachably couple with the accessory. Numerous other aspects are provided.

Abstract: The cement admixture of the present invention can provide viscosity decreasing ability as well as a high dispersing ability and slump loss preventing ability even in a high water reducing ratio range. The above-mentioned cement admixture comprises three components of a copolymer (A) containing a constituent unit (I) derived from the unsaturated (poly)alkylene glycol ether monomer (a) and a constituent unit (II) derived from a maleic acid monomer (b), a specific unsaturated (poly)alkylene glycol ether monomer (a) and a non-polymerizable (poly)alkylene glycol (B) having no alkenyl group.