Mary-Kate and Ashley Olsen are "thrilled" that their range of Superga sneakers sold out.

The design duo - who have ranges including Elizabeth and James and The Row - were delighted when they were asked by Steve Madden to be involved with the collection and are pleased with how they have been received.

"When we first met with Steve Madden, who we've collaborated with for a long time, I was wearing my old, beat-up Supergas and he said, 'Oh I've been wanting to buy that company,' and I said, 'Well, you know if you do, please think of us.' Now our styles for The Row have sold out in a matter of hours when they first came online, and were thrilled, we really are," Ashley said.

However Mary-Kate's favorite pair in the collection are not even ones she can wear: "You just want to grab all the little baby ones, the little cashmere baby ones. They're amazing."

Mary-Kate has previously revealed she would never leave the house if she wasn't happy with her outfit: "I think as soon as you start dressing for someone else, it goes wrong. I can't leave the house if I don't like what I'm wearing. I mean, I literally can't."