The Fly Bikes Uno combo is a 1 piece seat/post combo made from a nylon/fiberglass compound that is stronger then regular nylon. The top is lightly padded with the flybikes logo embossed in the nose and rear of the seat. The post is reinforced with an alloy Ibeam that helps prevent bending or crushing the post when its tightened. It comes in at only 10.4oz