When I have to use a thimble, I use a metal quilter's thimble with the lip around the tip so that the needle won't slip. Recently, in the middle of tying a quilt, my thimble got lost. I had to make a spec ail trip to Hobby Lobby to buy another one. I, too, am between sizes. I usually take a small, but some days, I need a medium. That day, I couldn't find fit her one, and all the regular thimbles in the house without the lip just would not work.