Product functions: Sun protection, UV protection, windproof, sandproof, mosquito repellent Product Features: 1. The material is milk silk, comfortable to wear, breathable; quite smooth and more elastic. 2. It has good elasticity and can fully cover every part of the head and neck, making it more snug and comfortable.Extremely lightweight and very easy to maintain. 2。Although it's thin, it has strong elasticity and is suitable for dust and insect protection.Wearing it inside the helmet can better protect the head, ears, and mouth.The length can completely cover the neck to prevent mosquito bites and dust intrusion. 3. Foreign countries call this type of headgear a Balaclava hat, which serves the purpose of covering the face, hiding identity, and protecting the head, and is used in many fields.Such as simulated CS, outdoor windproof and sandproof, sun protection, dustproof for special environments, head protection for alpine skiing, racing athletes, etc. Note: This head cover is suitable for spring, summer, and autumn. It does not provide warmth in winter but can protect against sun and UV rays. It is usually worn under a helmet and not alone.If worn alone, it is generally used for sun protection and windproofing during outdoor cycling activities, and cannot be used as a thermal headgear.0k Don't buy it again and complain that it's too thin and not warm.This head cover is a thin style, a thin face-covering pullover hat. The quality is super elastic, thin and breathable, can prevent wind and sand from blowing into hair, ears, nose, and mouth.It is a great protective gear for areas with frequent wind and dust storms in spring, summer, and autumn.Also suitable for riding bicycles, motorcycles, electric scooters, windproof, dustproof, sunproof, UV protection