To keep summer beverages cold, there is the Tjiller. This drink-cooling cozy is made from a hard polystyrene outer shell that insulates an inner layer of patented gel. The aluminum coating will release the cold from the gel very slowly, which is the reason for its ability to keep drinks cold for a long period of time. The Wine Tjiller can keep a drink cold for up to nine hours. While most coolers give off condensation, the Tjiller has zero condensation. Currently, the Tjiller is available for $13, and the Wine Tjiller is available for $20.