Gossard Sueprboost Lace Slip. Exclusive vintage corded stretch lace for superior fit and comfort. This product is recommended as hand wash only. Introducing the new Superboost Lace Slip in black featuring microfibre for delicate softness and soft stretch corded lace for a touch of glamour. Womens Superboost Lace Slip - Black - XS - Introducing the new Superboost Lace Slip in black featuring microfibre for delicate softness and soft stretch corded lace for a touch of glamour.