I'm 5'1, wear 6 1/2 to 7 in leather gloves and usually, the fingertips are just slightly too long. I bought the size small in these and finger length is perfect. Thickness is also just right for under larger gloves or mittens. Would definitely recommend these!
I purchased these for myself for snow blowing inside my mittens and for my daughter. I found my hands were still quite cold and am more comfortable using a regular thin glove inside my mitten. They fit easily inside mittens so they are handy for tasks that require removing mittens for dexterity.