Stretching it on took a bit of effort the first time, but the elastic material holds up well and stayed put the whole time. The extra 2,5 cm does make a difference once it's on.
Edward★★★★☆
The thickness boost is definitely real, it feels noticeably fuller. The elastic material stretches well but it takes a bit of fiddling to roll on smoothly, so set aside some time. Waterproof claim holds up fine for cleanup.
Abigail U.★★★★☆
The material stretches well and stays put once it's on, and the extra thickness is definitely noticeable. I do wish the length gain felt closer to the advertised 2.5 cm, but overall it did what I hoped for the price.