Doesn't look like the photo
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 hard to put on the dog's neck. Luckily, I cut it with plenty of extra length, so it should still be usable. Maybe even leaving a bit more would have been helpful (I left about 3 cm, but probably 5 cm extra around the neck would be better).