Material- The ends of the glasses chain are made of extra soft silicone and the coated tear-resistant strap convinces with an incomparable smooth wearing comfort, tough but soft, not easy to fray or break, can serve you for long time.Won't slip off- The high elastic silicone at both ends of the sports glasses strap tightly wraps the temples, glasses strap fixes the glasses on the head or neck.Especially plays an important role in sports and outdoor activities, etc.Adjustable & Flexible- Adjustable length of the sports glasses strap can be extend from 20.5~30cm/8.07~11.8inch, can be adjusted to fit your head perfectly.Ideal for the outdoorsman or outdoors woman.Multi-Function- When you are not using sunglasses, glasses neck cord can keeps your glasses secure around your neck, which not only never worry about losing your glasses.Keep your sunglasses safe and securePerfect For any Activity- Whether you are climbing, surfing, fishing, sailing, jogging or downhill biking: the strap secures your glasses reliably and protects them from loss and falls.