Liquid core dice contain a glycerin/water mixture that can freeze in extremely cold temperatures, which has the potential to crack the dice. I have temperature tested my liquid cores in my freezer at -8° F for week long periods with no freezing or cracking, but I cannot guarantee their survival in cold weather. Please be aware that once dice have shipped I can no longer be responsible for them, and I cannot offer refunds for dice that have been damaged due to weather. If you are ordering liquid cores in the winter months and/or in an especially cold climate, order at your own risk.