Glacier does not depend on online wallets or any other third parties. Your bitcoins are entirely within your control.
The electronic keys that secure your bitcoins are created and stored entirely offline, making them virtually invulnerable to electronic theft.
Multiple keys are required to access your bitcoins, greatly reducing the risk of loss due to physical theft or destruction of keys.
Glacier makes heavy use of well-secured software such as Bitcoin Core, and the Glacier’s own software is limited in scope and open source for public review.
Glacier is an open source project provided at no cost to the Bitcoin community.
Glacier is intended for security-critical scenarios, not everyday use. The protocol requires several hours and several hundred dollars of equipment to execute.