INUTEQ Water Vest - No battery required, can be used simply by pouring 500ml of water from the water inlet. I purchased this about 3 months ago and used it 2-3 times, but it was too big for me, so I am selling it. It has been washed. INUTEQ Water Vest Smart-X (Size L) is a cutting-edge cooling vest from the Dutch manufacturer INUTEQ. No battery or chemicals are required, and it effectively cools the body with only 500ml of water. Simply pour in water and wring it out to instantly feel cool. Product Features: Size: L (Chest 94-98cm, Shoulder Width 38cm, Length 57cm) Cools up to 15°C lower than the ambient temperature Cooling effect lasts up to 72 hours Easy to use, just add water and gently wring it out Patented INUTEQ-DRY technology maintains a dry feel both inside and out Antibacterial treatment for hygiene, machine washable Lightweight, non-toxic, and durable material No maintenance required, reusable Material Composition: Outer fabric: INUTEQ-DRY nylon jersey 50%, PU 50% (antibacterial treatment) Core fabric: Sweat-wicking and quick-drying polyester fleece Lining: INUTEQ-DRY nylon Size Chart (Reference) Size Chest (cm) Shoulder Width (cm) Length (cm) M 94-98 38 57 L 98-102 39 58 XL 102-106 41 59 How to Use: Pour about 500ml of water from the water inlet Distribute the water evenly and gently wring out the excess water You can immediately feel the cooling effect Uses and Recommended Situations: Outdoor work Construction sites Sports viewing and festivals Commuting to work or school Ideal for heatstroke prevention Bodycool Smart-X achieves a light and dry feel. Please try it for summer heat対策.