Quick answer
Are Disposable Hand Warmers Worth Bringing to Antarctica?
Disposable hand warmers are small, inexpensive backups for cold landings, Zodiac rides, and photography sessions. They are especially useful for people with cold fingers or anyone handling cameras outside.
Before departure
Use warmers according to their packaging, carry spare gloves and keep waterproof protection handy. Warmers are a backup rather than a substitute for suitable clothing.