The Petmate Silicone Round Travel Pet Bowl has a unique collapsible design that folds down to less than 1/2" making it great for travel; trips to the park; and even walks. Each bowl can be used at full or half height. Constructed using silicon; a durable; non-porous material that is made to last through years of use. The small bowl expands to 1 1/2 cups; while the large expands to 3 cups; plus it can be used at full or half height.