Medium size Bani Bands fit every head shape. Our most popular width with lots of great styles to chose from. All Bani Bands fit child to large adult heads since they are all adjustable! All are lined with our unique 'soft-grip' fabric backing so they 'stick' to your hair and won't slip off while exercising. Our Soft-Grip fabric won't ever cause breakage (like pre-wrap does) and it wicks away sweat.