Which material is commonly used in the application of nail enhancements to improve durability?

Acrylic is a widely used material in the application of nail enhancements primarily because of its strength and durability. When acrylic is applied, it forms a hard layer over the natural nail, providing protection and enhancing the aesthetic appeal. This polymer-based material can be sculpted and shaped to create various nail designs, making it a versatile choice for nail technicians and clients alike. Its ability to withstand daily wear and tear without easily chipping or breaking is a key factor in its popularity within the industry.

The other options do not serve the same purpose. Water, while essential for many beauty processes, does not provide any structural support or enhancement to nails. Gelatin is a protein that does not possess the same durability or effectiveness as acrylic for nail enhancements and can even break down easily when wet. Cotton is primarily used for maintenance and cleaning rather than the actual enhancement process. Thus, acrylic stands out as the preferred choice for improving the durability of nail enhancements.