He is not scared of the fly mask or the velcro noise or anything like that, he just doesn't like them , we actually washed our cashel one yesterday( the last surviving one), and my daughter went to put it on him today...she would put it on, walk out the pen, shut the gate, he'd take it off. She would go back in put it back on walk out the gate, boom he'd take it off, this went on about 5 time then she called me to come watch....this whole time I thought he was rubbing the velcro on our post to get it off. I was completely wrong he actually rubbed one ear on the feeder got the band over one ear! Then would do the next ear and then simply slip it off. He did all this in about 20 seconds! I think we have tried farnam also I think it is one of the ones hanging in the barn shed ripped to shreds! ANd the cashel is double Velcro but I know now that is not how he is getting them off! LOL, I just don't know what to use!!!!! I would be willing to spend the money if I Knew there was even a 80% chance he would keep it on!!!