A snap fastener has female and male snaps. The female snap, and in one embodiment the male snap, are thermoformed from sheets of thermoplastic material having a uniform thickness, in integration with the objects which the snaps are provided to join. In one use, an array of spaced-part fasteners is used to join a rear portion of a vehicle cargo liner to a front portion thereof. The fastener has particular application in fastening thermoformed articles of low flexural modulus.