I like very narrow reins, I love the ones I have at the moment that are leather with a rubber grip on the inside only and are either 1/2" or 3/8" width. I find when they're narrow they sit in my hand better and so don't slip through my fingers if I do have a contact. However someone noticed them the other day and was horrified that I had them on a powerfully built hot cob, saying they were downright dangerous. I smiled and walked away, she's not to know how light he is in the mouth and how little I rely on his reins. It did get me thinking though - where's the logic in that argument? A horse can easily break 1" reins if it treads on them or gets them caught up, but no matter how hard I yanked or pulled I couldn't break my narrow reins, so realistically they're not going to break when I'm riding as a result of anything I do. Sure if they cracked or split they would weaken quicker, but then I wouldn't want to be using any reins that showed signs of cracking, splitting, or drying out. It just feels like an old wives tale to me, something that people are told but that really makes no sense if looked at logically. What do you think?