Lovely, soft elastic with great stretch recovery. Satin one side and matt the other - you choose the 'right' side. Use for a clean edge finish in all types of lingerie.
The example photo shows the fold over elastic applied to the waistband and leg holes of the Marie Panties (pattern by Evie la Luve.) The elastic is folded in half along the fold line, enclosing the raw edge of the fabric.