Great gloves, I wear Handroid Pods (only a medium though!) and the other half wears Biomech or Zero 2 daily depending on the weather.
He would wear a large 10 but bought a pair of Handroids and one of the exoskeletons used to press on one of his fingers when riding, so for his bio mechs and zero's he went for 11 xl and they are spot on.
Think the last pair came from MandP.co.uk.
If you can afford it buy both sizes and then send one back, a more expensive way of doing it but then you can be sure of the size. Pick an online retailer with good returns policy.
Nothing worse than paying £170 for gloves and then wishing you'd have gone for a different size. Been there done that......