A fastener element (10, 11, 32, 34, 90, 100, 120, 121, 123, 127, 129, 139, 142, 146, 170, 174, 350, 370) with a sheet-form base (14) and an array of wedge-shaped engageable elements (12) molded integrally with a surface of the sheet-form base. The wedge-shaped elements each have a steep side (18) and a gradually rising side (20), and are arranged with their steep sides all directed in a common sense, such that the array can engage a similar array of oppositely-directed wedge-shaped elements to resist shear motion. The distal edges (17) of the wedges are curved in top view.