Material:Silicone COMFORTABLE AND NATURAL-INVISIBLE BAR Gifts for Women better fit your chest curve, and make your chest look fuller The thinner edge and middle part can better protect and hide your nipples even under the solid color clothes.Perfect solutions for Tops,Blouse Shirts,Strapless, Backless,Deep-V,Wedding Dress,Swimwear,and Gowns PERFECT SIZE size fits A / B Cup: diameter 3.74, weight 0.25lb. It is light, comfortable, and easy to carry. Ideal for backless or strapless evening dresses, low-cut outfits, party dresses, etc. This invisible push-up bra complements any sexy dress style, making you an absolute focus. Applicable to weddings, proms, dinners, parties, vacations and any other formal or informal occasions. NUTURAL AND HARMLESS Made of healthy and breathable fabric and natural biological gel. The push-up bras made of medical-grade silica gel will not cause irritation or harm. Comfortable to wear and suitable for sensitive skin. The strapless bras are attached to skin with adhesive made of harmless biological silica gel. It is more comfortable and healthier to wear and the push-up effect will be more natural Using Steps: Step 1: Wash breasts and fingers thoroughly Step 2: Uncover the dust film from the nipple covers Step 3: Put the central protection point(sometimes it is not completely in the middle) of nipple cover on to the nipple softly, making the outer edge of which be stick to the skin