ター 3 The size is good for my iPhone 11, and I keep my keys in the little chain pocket. Also the credit card compartment in the back is waterproof and does not gets sweat from the arm.But it took a little getting used to, to make it fit snugly on my arm. It will slip while using during cycling, so I need to place the bottom of the phone just above the bulge of my upper forearm muscle.