Pocket mat

A mat for use in covering a slope or bank of a waterway, and comprising a web of synthetic yarn, said fabric being permeable to water, but impermeable to sand and earth, and a plurality of pockets succeeding one another in the longitudinal direction of the web and each extending over a transverse portion of said web, said pockets having rear walls constituted by said web of fabric, and in use being in contact with the ground, and said pockets being further constituted by a second web of fabric, which is interwoven with the web first-mentioned to form a double cloth, both in transverse narrow strips extending between each adjacent pair of pockets substantially throughout said transverse portion, and in a continuous longitudinal narrow strip interconnecting a marginal portion of said second web with the web first-mentioned.