【Product Details】Belt Length: Approximately 28cm to approximately 63cm Belt Width: Approximately 2.5cm Made of durable nylon material and equipped with non-slip buttons for secure fastening. Comes with a convenient and easy-to-use D-ring hook. The D-ring hook is perfect for outdoor activities and travel. When you put things you want to use quickly, like sunglasses or a camera, in your backpack, it can be a hassle to take them out, right? With the D-ring hook, you can hang them and quickly access them when the cloudy sky suddenly clears, or when you're faced with a breathtaking view that makes you want to shout. Backpacks can hold a lot of stuff, so you tend to pack them full. Have you ever felt, "Oh, this is heavier than I thought..." when you put it on? This chest strap allows you to keep your backpack close to your body, making it feel like it's part of you! Balance and Stability: Using this product provides good balance and stability, relieving fatigue in your shoulders and lower back. Makes carrying a heavy backpack easier! No discomfort: With strong fixation, it won't slip up or down. Can be used for children's backpacks, commuter backpacks, and mountaineering backpacks. The cause of back-carrying fatigue isn't just weight.