Hold-ups or stay-ups are stockings with an elasticized band at the top, designed to hold the stockings up when worn, without the use of a garter belt or garters. Thigh highs are held up by one or more bands sewn to the top that is backed with silicone on its inner surface. This ensures the thigh highs stay in position because of the elastic and the friction of the silicone against the skin. The silicone can become ineffective by contact with body lotions, oils and talcum powder, as they all reduce the friction of the silicone. Thigh highs are designed so that the elastic band exerts just the right pressure on a woman's thigh, avoiding any uncomfortable tightness or unflattering muffin-top effect. Sometimes thigh highs are preferred to pantyhose for hygiene reasons, because they reduce excessive microbial growth around the groin due to humidity and warmth.