Building on over a decade of experience in collapsible drinkware, the Frontier Collapsible Cup has been engineered to be sleeker, more erognomic and lighter. Glass reinforced nylon 66 is used for the base, rim and center ring providing more stability and allowing you to grip the cup more easily. EU food grade silicone rubber sidewalls let the cup shrink down to less than 2 cm in height. Designed to nest/stack, these cups really do fit in anywhere.Features:- Collapses flat to less than 2 cm thick – Frontier Cups fit into your pocket- Made from BPA-free, food-grade silicone, with nylong rings to maintain shape and shield fingertips from heat- Base, rim and center ring made of light-yet-durable glass-reinforced nylon 66- Weighing a mere 54g, this 355ml, space-saving cup takes lightweight functionality to a new level- Nests with other Frontier Dinnerware and the 2L Pouring PotSpecs:Depth: 3.5 inDimensions: 4 x 4 x 3.5 inVolume: 400 ml