Educational Design: Features rotatable rings with numbers and mathematical symbols (addition, subtraction, multiplication, division) that allow kids to solve simple math problems.
Capacity & Materials: Most models have a 430ml (approximately 15 oz) capacity. They are typically constructed with a 316 stainless steel interior for insulation and a BPA-free plastic exterior.
Functional Details:
Straw & Lid: Includes a one-button pop-up lid with a food-grade silicone straw.
Portability: Equipped with a carry handle and an adjustable shoulder strap for easy transport to school or outings.
Insulation: Designed to maintain the temperature of both hot and cold drinks for several hours.