The CSI hat is typically a standard baseball-style cap, often in a dark color such as navy blue or black. It may feature the letters "CSI" or "Forensics" embroidered on the front or side, making it easily identifiable as belonging to the crime scene investigation team. Some versions may also display the logo of the law enforcement agency or forensic unit.

The hat's design aims to maintain a professional appearance while offering practical benefits. It helps to keep the investigator's hair out of their face and reduces the risk of contaminating the crime scene with stray hairs or fibers. Moreover, the cap's brim helps shield the eyes from bright lights or harsh outdoor conditions, improving visibility during evidence collection and examination.

The CSI hat is a crucial part of the investigator's overall personal protective equipment (PPE) ensemble, which may also include gloves, a forensic suit, boot covers, and face masks. This PPE is essential for preserving the integrity of the crime scene, preventing cross-contamination, and ensuring that evidence is collected and handled properly.

In popular culture, crime scene investigators, often portrayed in TV shows like "CSI: Crime Scene Investigation," are commonly seen wearing these hats, adding to their distinctive appearance while working diligently to solve complex criminal cases. However, it's important to note that the portrayal of crime scene work in entertainment might differ from the reality of actual forensic investigations. In real-life scenarios, forensic professionals adhere to strict protocols and procedures to ensure the accuracy and integrity of their findings.