1) Made by Natural rubber 2) Resistant to boiling water 3) 100% leak proof, seamless mold 4) Meet BS1976 and EN71 standards 1) Made by Natural rubber + Knitted fabric2) Resistant to boiling water3) 100% leak proof, seamless mold4) Meet BS1976 and EN71 standards5) Volume: 2000ml, 1500ml, 1000ml, 750ml, 600ml, 500ml Knitted Hot Water Bottle