I purchased these two years ago, but I'm going on maternity leave and won't be using them for a while, so I'm selling them. I've worn them twice, and they're in excellent condition. The opening is elasticated on both sides, making them easy to put on. I usually wear a 23.5 cm sneaker. The size is listed as L, but I think they would fit someone who wears a 23.5-24.0 cm sneaker.