Fully adjustable. Standard width. Size guidlines: Suitable for use with bras in sizes 28 B-DD, 30 A-DD, 32 AA-D, 34 AA-B, 36 AA-B. Also available in a wider width for more support. See product T333040Z. In the interests of hygiene we are unable to offer a refund on toiletries, cosmetics, bra accessories, earrings for pierced ears, and any duvet or pillow product once opened. This does not affect your legal rights. Composition:  100% polyurethane. To view our Lingerie Guide click here