Crafted from high-quality borosilicate glass, it boasts excellent heat resistance and stability. The outer layer is paired with a food-grade heat-insulating silicone sleeve that is soft and non-slip, effectively blocking heat transfer to prevent your hand from getting burned by high temperatures when holding it. Meanwhile, it provides protection for the glass cup to reduce the risk of breakage if dropped. The portable handle makes it easy and hassle-free to carry, allowing you to meet your hydration needs anytime.