The technique of making a soumak involves wrappingwefts over four warpsbefore drawing them back under the last two warps. The process is repeated from selvedge to selvedge. Soumaks tend to be finely woven, and although not as durable as piled carpets, they are stronger thankilims. They are made in the Caucasus, southern Persia andAnatolia, by the Shahsavantribe in north-western Persia, and very rarely, by the Baloch on the Persia/Afghanistan border. Sizes vary, from carpet format to tiny tribal domestic bags. Unlike the kilim, which is usually reversible, weft strands on the underside of a soumak may be left uncut several inches long, possibly in order to provide extra warmth.
You can see very nice rare soumak rugs in the turkishrugs.net site.