• Easy to open clip on button with lock
• BPA and Phthalate free - all plastic parts are food grade
• 100% food grade stainless steel inside safety, strength and durability
• (18/8 quality, Grade SS304 inside and SS201 outside)
  
• Insulated double wall vacuum with copper coating for maximum temperature retention

This makes it perfect for busy professionals, students, or travelers who want to enjoy their drinks at the desired temperature throughout the day.