A device for connecting two or more pieces of fabric. The devices is formed as a bonding strip having a base and a plurality of spikes extending from the base. The bonding strip is formed of a material having a forming temperature that is lower than that of the fabric to be bonded. To bond the two or more pieces of fabric, the spikes are pushed through the fabric. The spikes are then formed at a temperature that is at least as high as the forming temperature of the bonding strip but lower than the forming temperature of the fabric. The forming can be performed so that the spikes bend over and press against the fabric. The spikes can be arranged on first and second rows along the bonding strip, and the forming can be performed such that spikes from the first strip connect with spikes of the second strip.

A seam for joining fabric edges in which coils of seam elements shaped as a symbol for infinity or a lemniscate, that is, infinity elements, are joined to the fabric edges and the infinity elements are joined to each other with a pintle. A fabric element may be configured as a continuous loop to form an industrial fabric employing the infinity seam elements.

The purpose of the present invention is to produce a three-dimensional formed body by connecting only cloth pieces without using a fixing device such as sewing. The peripheral edges of the central part of this bottom part cloth piece has first peripheral edge parts provided with first notches having the same shape as a basic cloth piece, and second peripheral edge parts provided with second notches. The first notches of the bottom part cloth piece are engaged with second notches of the basic cloth piece by matching each notch with a corresponding notch. The second notches of the bottom part cloth piece are engaged with first notches of the basic cloth piece by matching each notch with a corresponding notch.