【Neck-Hanging Photochromic Sunglasses】Have you ever had trouble finding a place to put your sunglasses after taking them off? These sunglasses can be hung around your neck, making them smart and stylish for carrying and storage. Plus, you'll worry much less about losing them. The basic square design is popular with people of all ages. The temples (arms) are designed to be long, providing a secure fit that prevents slipping and ensures a comfortable wear. Adding non-slip rubber to the temple tips significantly improves stability when hanging around the neck. These are reliable sunglasses that will become a part of your everyday life. 【Photochromic Lens Sunglasses】The lens color intensity changes depending on the amount of UV light. They become nearly clear indoors where there is less UV light, and change to a darker color outdoors where there is strong UV light.