This item is a must have for any sugar glider first aid kit. If your glider receives an injury or has surgery, they should be wearing one of these, to prevent further self injury.
They are fully adjustable. All you do is check the fitting around the neck. It should be loose enough to stick a finger underneath, but not too loose that they can get out of it. Once the proper fitting is found, then tape is applied to hold it in the position needed.
They do have the lambskin felt, to help prevent chaffing.