【Applicable to Water Bottles and Plastic Bottles】Made of a special elastic material that can be expanded to fit the size of the bottle. Suitable for bottles with a bottom diameter of 6cm to 7cm, 400ml-600ml thermos bottles and insulated bottles, and 500ml-700ml plastic bottles and sports water bottles. 【Protection for Thermos Bottles】Made of thick, soft material that cushions impacts and has excellent elasticity, perfectly fitting various water bottle shapes, protecting the bottle from drops and breakage, and preventing scratches. Applicable to Thermos, Zojirushi, and Tiger thermos bottles. 【Handheld and Shoulder Strap】The upgraded buckle is durable and long-lasting, allowing you to carry it by hand or hang it on a bag depending on the situation. Comes with a shoulder strap, allowing you to carry it on your shoulder. 【Cold and Heat Insulation】Made of special foamed rubber and nylon materials used in diving suits, it maintains the temperature like a diving suit. It can keep drinks cold or hot and acts as insulation from hot water.