Mouse too small

I cannot find a place on Logitech's website or e-mail address where I can send a general support request. All of the options want a specific device or serial etc. All I want to say is, I have had several Logitech mouses. Currently using a M650 which works OK. I issue I have is I have huge hands, all the mouses on the market, caters for teeny tiny hands? Also when buying these online, there is no indication on packaging etc to show size?