Zip fastener

A zip fastener (20) includes a first slider (10) disposed to slide lengthwise along a pair of stringers (12,13). The first slider (10) includes one of a male part (21) and a complementary female part (22). The other of the male part (21) and the female part (22) is formed on a member. The member may be a second slider (11) or a fixture (58) fixed to the stringers (12,13). The male part (21) comprises a neck (51) adjacent an enlarged head (50). The female part (22) comprises a transverse slot (35) with broad and narrow sections (37,38). In a two-handed operation, the male and female parts (21,22) are mutually engaged to connect the first slider (10) and the member by relative transverse movement, to pass the male part through a mouth (43) of the transverse slot (35). When latched closed in this way, axial separation of the first slider (10) from the member is precluded.