Rigid single mold polyurethane provides durability for chilling your temperature sensitive samples. Excellent insulation properties for ultra cold--use with ice, ice-salt slurries, and more. Minimize evaporation loss with snug fit lid. Easily remove with comfortable recessed knobs. Keyed lid and base fit together to conveniently store lid under base. Use handy pour spout with melted ice, water, and solutions. Ergonomic handles safely transport bucket or pan from work area to sink. Deep internal cavity has enough room to add one of your Heathrow racks. Tapered sides make stacking and storage compact.