I read the reviews & bought these 1/2 size up, IF you are a true size 9 1/2 you would need a 10! IF you are on the TIGHT side of a 9 1/2 you might even need a 10.5!
If you heed these ratios you will be happy with your FIRST order & will not need to exchange for a diff size! Good luck & happy volley-balling or jazzercise, zumba, or whatever!!!