1. The length of the mask ear loop should be suitable, too short will strangle the ears, and too long will have poor fit;
2. The material of the mask earloop must be elastic: the mask ear loop is made of spandex + nylon: because this material has high comfort, good elasticity, and does not hurt the skin;
3. Mask ear loop should be round and flat: usually mask ears have round and flat ears. According to the different masks, choose the appropriate ear straps, such as Purking ear loop. The regular specifications are complete and can be customized.