STX designed the Cell 4 line to simply be the best of the best for advanced youth, high school and collegiate players. STX took 25% of the weight out with a new foam technology but kept the soft feeling outer shell and big, wide velcro and rib protection. These pads also have a full back plate, which is absolutely necessary for older players. There really is nothing complicated, fancy or bells and whistles with these pads. They are simply light, soft, durable and the highest quality that your money can buy. The biggest differentiation here is comfort and soft feel. There is no other lacrosse shoulder pad on the market in this price point even close to the performance and quality of the STX Cell 4 shoulder pad liner.