The Lenovo ThinkPad X1 Carbon Gen 4 is a premium ultrabook designed for professionals seeking portability, performance, and durability. The Lenovo ThinkPad X1 Carbon Gen 4 is a premium ultrabook designed for professionals seeking a balance of performance, portability, and durability. The lightweight design, robust security features, and long battery life make the X1 Carbon a compelling choice for business users and frequent travelers.