If you are often on your knees, these knee protectors are a must. For use with trousers that have a special pocket so you can put them in or take them out whenever you like. You will probably soon find that you will never take them out since they are flexible and comfortable. Features: Pre-shaped for best protection and fit, embossed cut lines for personal size adjustments, fits Fjallraven trousers with openings for knee pads. Weight: 50 g. Material: EVA Foam.