Some helmet lenses are black to block uv rays, and some are black to look like black without blocking uv rays.

    First, helmet lenses, which are black, are filters and are the cheapest accessory that can significantly change the look of a photo.

    Helmet lenses do the following：

    Prevent glare and reduce eye fatigue, improve resolution, and provide some insulation。

    Secondly, for color photography, several basic compensation filters should be prepared, as well as some special effect filters to be mentioned later.

    Third, if you want to be good at black and white, you should carry three basic filters in your bag: medium yellow, light green and red.

    Cleaning inside the helmet when used for a long time, the inside of the helmet will often have dirt accumulation, and generate odor.In such cases, cleaning should be carried out.Use cleaner with neuter had better, use shampoo even better.In order to avoid odors left by cleaning agents, the amount used should be controlled.Don't scrub the inside of the helmet too hard.

    Otherwise, it will deform the buffer material and lose its buffer function.After cleaning, wipe off the moisture with a towel or paper towel and put it in a ventilated place to dry naturally. Do not use a hair dryer.

    Our helmets need to be cleaned regularly and it's very important to keep them clean. I hope it helps.

    The foam cushion material of helmet, some density is very low, even cannot compare with the foam cushion layer that installs home appliance to use, dig to break easily -- unqualified.

    Some of the lining material is very uncomfortable to touch, please pay attention to the choice.

    Be careful to make helmets from recycled materials in small factories. Helmets will break when you drop them lightly, and when the sun shines, they will smell and soften, and may contain some toxic and harmful substances in the garbage during recycling.Because this kind of helmet is extremely cheap, many people buy it. For the sake of safety, please don't be cheap.

    How to buy motorcycle helmet to drive and ride motorcycle must wear safety helmet, which is our country's road traffic management regulations, but also to ensure the safety of motorcycle drivers important measures.Wear a helmet, should wear a helmet with safety protection performance, therefore, to master some knowledge of safety helmets, buy a helmet with safety, the correct use and maintenance of helmets is very necessary.

    The shell of the helmet plays an important role in the safety of the helmet, so the choice of its material is very important.In general.The material used is ABS and glass fiber.Good helmets are made of carbon fibre, but they are expensive.

    Buffer layer the main function of buffer layer is to absorb external impact.Imagine a helmet with a hard shell. If there is no buffer layer, when the external force hits the head, the external force will directly apply to the head through the hard shell, causing the head to be hurt.Therefore, the thickness of the buffer layer and the quality of the material determine the buffer capacity of the helmet.The buffer layer is mainly made of styrene foamed.

    The main function of the inner lining is to enhance the comfort of wearing, and it is usually made of soft flannelette.

    The purpose of the cap strap is to secure the helmet firmly to the head.Its combination of the following ways: camphor type, ring buckle type, paste cloth type.

    The jaw guard is part of the full helmet, which has extra protection for the lips and jaw below the nose, giving more protection to the face when struck.Full helmet type helmets generally have.Air inlet and air outlet.

    The lens protector can protect the eyes and face. It is made of plastic (such as polycarbonate resin) and reinforced glass (such as PMMA resin), among which the reinforced glass has excellent scratch resistance.It is suggested that readers should choose a mirror protector made of better materials as far as possible, because poor materials can easily break and stab the face when impacted.