Doesn't look like the picture
In reality, it keeps a triangular shape. It's a thick, hollow tube that doesn't hold a circular form. It's flexible, but the way it bends makes it difficult to put on the dog's neck. Luckily, I cut it with a lot of extra length, so it should still be usable. Maybe even leaving more extra would be helpful (I left about 3 cm, but it's probably better to leave 5 cm more than the neck circumference).