Why might divers require additional thermal protection during Nitrox diving?

Divers might require additional thermal protection during Nitrox diving primarily to maintain comfort on long dives. Nitrox, which typically has a higher oxygen content compared to standard air, allows divers to extend their bottom times and dive deeper than they might with air alone. As dive durations increase, so does the potential for body heat loss, particularly in colder water environments.

Maintaining comfort is crucial not only for the diver’s enjoyment but also for safety. Hypothermia can impair judgment and physical performance, increasing the risk of accidents. Additional thermal protection, such as wetsuits or drysuits, helps to retain body heat, ensuring that divers remain comfortable and focused throughout longer dives.

Although other factors may influence a diver's choice of thermal protection, maintaining comfort during extended underwater activities is the most relevant reason in the context of Nitrox diving.