Hooded towels can indeed provide some degree of sun protection for the head during outdoor activities, but their effectiveness may be limited. Hooded towels typically use materials such as cotton or microfiber, which have some sun protection properties and can block some penetration of ultraviolet rays, thereby reducing exposure of the head to UV radiation.
Especially in hot summer weather, using a hooded towel can decrease the time the head is exposed to sunlight, reducing the risk of sunburn. However, it's important to note that hooded towels are not specifically designed for sun protection, and their effectiveness in this regard may be relatively limited compared to specialized sun hats or clothing. Therefore, when spending extended periods outdoors in the sun, it's advisable to use additional sun protection measures such as wearing a hat and applying sunscreen to better protect the head and skin from UV damage.