Features ‧ Vacuum Insulation: Cold for 24 hours. Hot for 12 hours. ‧ These bottles are totally leak proof. ‧ Silicone seals means no plastic ever needs to touch your water again. ‧ Rubber base for soft landings ‧ Lids are insulated for extra temperature control. ‧ Lids have quick twist and soft silicone close. ‧ Cup holder friendly. ‧ Handwash bottle. Dishwasher friendly lid. Freezing not recommended.