Retaining strap for FSB drop-down support rail with strap holder, for toilets and showers, with self-securing eyelet fastenings, padded, variably adjustable to individual body proportions, enables a person to sit unassisted whilst nevertheless being held stably in place, for use in combination with FSB strap holder, Product Code 82 8290 00016 8122, PUR and polyester, Dark Grey approximating to RAL 7021.