What feature of full-fingered gloves improves rider safety?

The feature of full-fingered gloves that enhances rider safety is the design of the fingers, which are often curved to provide a better grip on the motorcycle controls. This ergonomic feature allows for a more natural hand position, which can improve the rider's control over the motorcycle, especially during maneuvers that require precision, such as braking and throttle control. A better grip helps in reducing hand fatigue and allows the rider to maintain firm control, which is crucial for safe riding.

While other options may seem appealing, they do not directly contribute to the overall safety of the rider in the same way. For instance, short sleeves focus more on comfort rather than protection, a smooth surface may be aesthetically pleasing but does not enhance functionality, and increased weight could imply durability but might negatively affect maneuverability and comfort. Thus, the curvature of the fingers in full-fingered gloves is specifically tailored to improve grip and control, directly impacting rider safety.