My Mum is in England and getting me a pair of Felcos for my birthday but I need to tell her which ones to get. I've looked through their website and there doesn't seem to be a sizing guide. Most of their products are for large hands but I'm not sure how big 'large' is. My hand is L17.5, W 7.5, Hand span 20.5. Is there anyone with similar size hands and experience with Felcos who could advise me?