y cling to face, the softly exquisite material void to bring any unsuitable feeling to face.
松紧带 silicone strap材质：单面绒毛带
特点：可以自由调节长短的防滑(或普通)高弹力松紧带,可适应任何头型配戴
Specialty: adjustable non-slip (or common high elastic strap; can be adapted to any size of head-wear
采用人体光学设计，间隙透气，其视野开阔并可阻挡强风，雪粒，雾气及各种强光。
Use optics design of the human body, have good exhaust ventilation, widely vision and can avoid strong winds, snow grains,