A male touch fastener strip includes an elongated base and a field of male fastener elements. The male touch fastener strip also includes longitudinal barrier walls rising from the broad face of the base on either side of the field of male fastener elements, and a pair of segmented walls. Each segmented wall and its nearest longitudinal barrier wall define therebetween a foam relief space. Each segmented wall defines a flow gap for allowing the foam material to enter the foam relief space.