Nick has it spot on!!
When I am in a hand, my cards are protected by my hand(s). I don't consider anything else adequate protection. If a player has a spinner or ornament or something similar, ie, card protector, on top of the hole cards and another players cards get fully mixed, even by total accident, how do you tell which cards were which? Players have to take some responsibility in this game and protecting their hole cards is one of the things the player is responsible for.
Chet