No refills needed with this whopper! Offering maximum hydration. an insulated stainless steel, and baked in design; your water will stay cute and ice-cold this summer hour after hour. The ergonomic handle includes comfort-grip for easy carrying and the narrow base fits in just about any car cup holder. Includes a straw for sipping without spilling while on the move or just twist top lid to allow for open lid drinking. Just twist the lid to seal close!