That is a common fear however most customers find that if you pull the sleeve up as far as possible so it’s snug at the bottom and “break it in” over time, this isn’t an issue. Plus, the weight of the drink keeps it grounded.
We do not recommend using JavaSok's on hot beverages. Our HotSok is designed for hot drinks because our Thermafoil technology does a much better job at keeping your hand from burning and keeping your drink warm.
We recommend hand washing your Sok and drying completely! Drying is important because you don't want the Sok to retain moisture. You can also machine wash on a gentle cycle and then air dry but we prefer hand washing because machine washing will lighten colors over time.