The Stanley x Starbucks Flowstate Quencher 40oz Tumbler Spring Blue is part of a collaboration between Starbucks and Stanley, a heritage brand known for its high-quality outdoor products and long-lasting drinkwear. Like other versions of the Stanley x Starbucks Flowstate Quencher 40oz Tumbler, the "Spring Blue" iteration is made of durable stainless steel, which means it’s resistant to wear.