If you go to quilt shows, Tommie Lane sells thimbles custom made for your finger. The Thimble Lady sells thimbles also. Otherwise, try on metal thimbles until you find one that is comfortable, either with a hole for your fingernail or closed in. If it feels loose sometimes, put part of a bandaid on the inside or if you have lost weight, insert a strip of moleskin to get the fit you want.