1.Appropriate SizeThe chest bag size can accommodate items that need to be carried with you for outdoor sports, such as mobile phones, keys, watches, wallets, skipping ropes, snacks, etc. The right size frees your hands and does not increase the burden during exercise 2. [Reflective seat belt] The back of the chest pack adds a reflective seat belt design to make outdoor sports at night safer 3.WaterproofThe chest bag is designed with waterproof material, which can protect the contents of the bag from moisture when it rains 4.AdjustableThe shoulder straps and waist belt are adjustable, suitable for people of different heights and weights. Elastic waistband reduces adjustment per wearProducts from NIUNIU's store