Please read my profile. SHEIN Boots Black Faux leather The opening is made of a material like a sturdy sock. The size is marked as 40, but despite their chunky appearance, the inside is narrow in width. I think they would be just right for someone who usually wears a 24.5 or 25cm. I have wide feet and usually wear a 24.5cm in sneakers. These have some toe room but the width is just right. Tried on only at home, unused.