1st Step - Cup With Silicone Straw This cup is very durable that is tougher and thicker than most sippy cups. The Sport Sipper also has a no-slip grip around the middle of the cup for your child''s hands to hold firmly. If your child is "tough" on cups this one''s for you! The Sport Sipper comes with a Sport Sipper nipple-shaped spout but the Gripper Sippy Cup Replacement Spout also fits this cup. Includes hard protective cap. No valve! No mess! No more leaky valves! 1stStep - Cup With Silicone Straw This cup is very durable that is tougher and thicker than most sippy cups. The Sport Sipper also has a no-slip grip around the middle of the cup for your child''s hands to hold firmly. If your child is "tough" on cups this one''s for you! The Sport Sipper comes with a Sport Sipper nipple-shaped spout but the Gripper Sippy Cup Replacement Spout also fits this cup. Includes hard protective cap. No valve! No mess! No more leaky valves!