The combination of BPA-free, EU food-grade silicone rubber and 304 stainless steel makes the Detour Collapsible Mug the epitome of packable and durable. The Cool-Grip fins molded into the side walls protect you from hot or cold for a more comfortable grip and it collapses down to a fraction of its original size for nesting and storage. When space is at a premium, this is the premium 475ml mug you want. Features Crafted with EU food-grade silicone rubber and durable stainless steel for the strongest collapsible mug ever Innovative design enables the mug to collapse down to 31mm (1.25") tall for storage or expands to a full-function 475ml mug. Mugs feature Cool-Grip fins molded into the sidewalls so you can comfortably hold hot or cold beverages Sea to Summit invented collapsible tableware and this is our strongest collapsible mug yet Generous 16oz capacity for more of your favorite hot or cold drink Please be aware that this product may become hot when used with hot contents. Handle and use with caution. Sea to Summit Guarantee is offered for the Lifetime of this product Features: - Mugs feature CoolGrip fins moulded into the sidewalls so you can comfortably hold hot or cold beverages - Generous 475ml capacity for more of your favourite hot or cold drink - Advisory: Please be aware that this product may become hot when used with hot contents. Handle and use with caution