Built with ceramic interior, this reusable cup is designed to provide a consistent temperature and flavour for 3-6 hours to ensure the first sip is no different to the last. Ceramic inside German engineered Greblon water-based ceramic shatterproof. Easy to clean. Ensures you can taste each note in your brew. Double wall insulation Temperature matters. Stays hot up to 3 hours. Perfect grip Ergonomically designed to fit perfectly in your hand. Spill-proof lid Double layered rubber grip to secure seals and prevent unnecessary spillage. Light weight 183g, looks like ceramic but weighs 2x less. Reusable High quality food grade 304 stainless steel, an investment piece that will last forever. GOLD WINNER in the product design category of the 2018 Good Design Awards Wash and rinse the product thoroughly before first use and after each use. Rinse lid immediately after each use with warm water. Hand-wash the body with warm soapy water. STTOKE cups are NOT dishwasher safe! Running a STTOKE through the dishwasher can cause paint to chip and the vacuum seal to become ineffective.