If it is worn in winter, it keeps temperature close to body temperature by preventing the escape of heat to the outside. (judithcurry.com)
I have recommended «hidden fence» systems, and / or fenced back yards, to many customers over the years to prevent escapes from the property. (samthedogtrainer.com)
Having them hold the hamster over a large box will help prevent it escaping if it jumps away from them. (yourpethamster.com)