The Aquaspeed Mega 100-19 swimming cap for adults is made of silicone in gray color, offering excellent compatibility and durability. The silicone material ensures flexibility and comfort while simultaneously reducing water resistance, making it easier for the swimmer to glide through the water. Using this cap keeps hair neatly confined close to the head, preventing hair from falling into the water and protecting it from the chlorinated environment of the pool. While it doesn't keep hair completely dry, it reduces contact with water and helps retain head warmth during the winter months. It is ideal for daily training and can withstand usage with minimal care.