My patented Classic My Favorite Thimbles are the closed top design with an oval shape that fits your finger better than any other brand of metal thimble. They also have a flexible rubbery coating that helps keep the needle from jumping off your thimble. My Favorite Thimbles are currently available in sizes petite, small, medium and large.
FYI, because the rubber coating doesn't last forever, these thimbles can be re-coated for a nominal charge of $1.00 plus shipping. I recommend that you buy two My Favorite Thimbles in your size so that one can be "in use" while the other is "in the shop".