An implant configured to treat prolapse of a pelvic organ includes a support member and an extension portion projecting from the support member. The extension portion has a barbed fixation means provided thereon for anchoring the extension portion into pelvic paravaginal tissue. The barbed fixation means allow bi-directional adjustment of the barbed fixation means relative to the tissue, and when suitably located, the barbed fixation means engage the tissue. The support member comprises a mesh material having a mass density of less than 50 g/m2.