Okay, that's a complicated review. Collar straighteners fit and do their job as intended and of course don't warp in the dryer. Behind this, however, lies a very serious danger; They have two pointed pieces of metal pointing straight at your collarbone and calf. Someone pushes you wrong, you trip, your friend pushes you for fun, you get into an accident, well now you also have two metal objects aimed at your neck so good luck with that, back to the plastic.