I have tried on plenty of Isotoners on in the stores and none of them have ever fit me properly.  I would generally try on the size=large, and they'd be too tight or fingers would be too short.  I don't know if I have even ever purchased Isotoners, because of the bad fit.  I took a chance on these, figuring if they didn't fit, I'd give them to my mom, a big Isotoner fan.  While these gloves literally fit like a glove, they are extremely comfortable and are a perfect fit for me.  Sorry mom ;)