These are my new favorite thimbles.
Protect and Grip Thimbles offer the perfect combination of soft, elastic material with the safety of a metal thimble cap. The scallop design offers breathability, keeping your finger cool. Its excellent elasticity helps the thimble form naturally to your fingertip for a light fit. Safe and smart, the ridged and dimpled metal cap holds the needle tip in place and pushes needles in safely. This new thimble provides comfort and lightness.
6025 Small - 14.5mm (9/16")
6026 Medium - 15.5mm (5/8")
6027 Large - 17mm (21/32")
If you don't already use a thimble then this one could the one to convince you you should. !