I have two of the padded ones in f and xf and the sizing on my horses is pretty standard compared to other makes. I've been really pleased with them and they seem good quality.
I have the one with the silver piping, my TB is usually a cob size and the Rhinegold comes pretty true to size. Love mine but dont know what it would be like used hard everyday, only use mine for competitions.
I'd get a Cotswold Sport Comfort bridle instead - has a more quality feel to it than the Rhinegold (although the R bridle I have used was a mates so have only used it briefly)...