Design and Details: Mugs feature Cool-Grip fins molded into the sidewalls so you can comfortably hold hot or cold beverages Innovative design enables the mug to collapse down to 31 mm (1.25") tall for storage Crafted with EU food-grade silicone rubber and durable stainless steel for the strongest collapsible mug ever Specs: Depth: 3.8" Dimensions: 3.9" x 3.9" x 3.8" Packed size: 3.9" x 3.9" x 1.2" Volume: 475 ml Weight: 3.7 oz