Slip over cat's head, buckle around the chest and let rest just below the neck. Use a tape measure to correctly fit the harness to your cat. Add 1 1/2 to 2" to the neck measurement in order to have room for the harness to fit over your cat's head. Measure around the chest, near the front shoulders, to find the correct harness size.
Coastal Pet Red Mesh Cat Harness, For necks 8"-10"
Pet Size: For Cats 8-12 lbs., For Chests 14"-16", For Necks 8"-10"