1. In a hairpiece comprising a foundation and hair in the form of a plurality of elongated wefts attached to said foundation, the improvement comprising: a group of pairs of wefts sewn sideby-side to said foundation in a circular pattern, each group consisting of a first weft and a second weft, wherein in each pair of said group the weft have hair attached thereto, wherein said first weft and said second weft are closely spaced and wherein the adjacent wefts of said pair are curled in opposite directions to define a pair of facing concave sections forming a tunnel-like effect, the hair of said first weft being curled to be C-shaped and the hair of said second weft being curled to be a backward C-shape so that said tunnel-like effect is provided by the C-shapes facing each other to form almost an O.