These elbow-length gloves from Blichmann Engineering are great for protecting your skin from sanitzing chemicals and for sanitary handling of brewing equipment. These are 28mil thick, three times thicker than common rubber household gloves.
To select your size, measure the circumference of your hand at the knuckles using a a piece of string in inches. That measurement corresponds with the glove diameter size. For half sizes, round up to the next size.
Gloves are available in Medium (size 8), Large (size 9), and Extra Large (size 10).