This is nice if you just want to collect them, because they are cute, but as an actual sleep mask, it's not very good. Uncomfortable materials, especially on the strap where it attaches at the back. Stiff velcro and it does not have a good length to adjust to. Hardly stays on, doesn't adjust to the face well. Feels very cheap. I'd avoid it if you were hoping to use this for an actual sleep mask, Blippo has much nicer ones to pick from :)