What features should I look for in the highest security bike lock to ensure the utmost protection for my bicycle?

When choosing a high-security bike lock, look for features such as a thick and durable material like hardened steel, a secure locking mechanism like a disc detainer or a double-bolt design, a high-security rating from independent testing organizations, and additional features like a protective cover or anti-theft guarantee. These features can help ensure the utmost protection for your bicycle against theft.