LONG-TERM HEAT: Our 2-pack hot water bottles have a large capacity of 2 liters and can retain heat longer than normal ones. Ideal for snuggling up in bed for extended periods and keeping hands, legs, stomach, or feet warm on winter nights. SAFE & DURABLE: Our hot water bottle uses high-quality thermoplastic rubber, which is non-toxic, recyclable, and skin-friendly. The thick, sturdy outer structure has a strong heat barrier and can protect you from overheating or burns. 100% safe to use. LEAK-PROOF DESIGN: The bottle mouth is wide enough for easy water filling and can prevent burns. It features a tight-fitting plug to prevent leakage. The hot water bottle is transparent, so you can easily check the water level inside. . SOFT KNITTED COVER: Our hot water bottle comes with a blue and a gray cover for additional skin protection. The bag cover is softly knitted to provide you with great comfort and can keep the hot water bag dust-free. Easy to apply or remove and machine washable.