A touch fastener (10,10A,10B,10C) including an elongated base (20) having multiple segments (25) connected by articulable joints (40). Each segment (25) has an upper surface (22), a lower surface (24), and a plurality of touch fastener elements (100) extending from the lower surface (24) of the base (20). A flexible barrier (30) extends across at least one articulable joint (40) between adjacent base segments (25). The fastener (10,10A,10B,10C) may include a magnetically attractable material (60,60A,60B,60C,60D) disposed along a center region (26) of the upper surface (22) of the base (20). The fastener base (20) may define a pair of first and second notches (50) in opposite longitudinal edges of the base (20) at the articulable joint (40) to allow bending of the base (20). The base (20) may also define a slit (55) extending through the base (20) from a longitudinal edge thereof at the articulable joint (40).