Used twice in low mountains after purchasing new. This is a lightweight and compact thermal bottle developed for mountaineering, providing excellent insulation even in extremely cold environments. When using with sports drinks, avoid prolonged use and be sure to clean thoroughly after use. Product Name: Montbell mont-bell Thermos Bottle Insulation Cold Retention Alpine Thermos Bottle 0.5L Product Size (approx.): Diameter 6cm, Height 22.5cm, Capacity 500ml, Weight 237g Specifications: Heat resistance/Cold resistance temperature: (Inner stopper) 100℃ / -20℃ (Outer stopper) 100℃ / -20℃ (Packing) 150℃ / -40℃ Heat retention/Cold retention effect (Room temperature 20±2℃) Heat retention: (Start) 95℃ (After 6 hours) 78℃ or more Cold retention: (Start) 4℃ (After 6 hours) 8℃ or less Materials: Body: (Outer) SUS304 Stainless steel (Inner) SUS316 Stainless steel Outer stopper: Polypropylene Inner stopper: Polypropylene Packing: Silicone rubber