Ultra thin folding design : Adopting a foldable design, it can be folded up to 60mm. It takes up very little space and is easy to carry. It allows you to drink water from your own cup anytime, anywhere, making it safer and more hygienic Durable and sturdy: It can withstand temperatures ranging from -58 F to 392 F (-50 C to 200 C), and whether you want a cold or hot drink, it can satisfy you, such as coffee [Safety Material]: Use food grade high-quality silicone, free of bisphenol A, which is harmless to the human body and can be used with confidence. It is not easily broken, lighter than glass, easy to clean, and can be cleaned under tap water. Leak proof : Simply press the lid on the top of the cup lightly to fully prevent leakage and dust. You don't need to worry about the liquid leaking out of your bag. You can also hang it on the handbag strap and portable hook Continuous use : Compared with disposable cups, it can be used continuously to avoid environmental pollution and can be used as office coffee cups, portable camping cups, travel cups, and telescopic school cups suitable for children.