1. Flexible Plastic outer shells are extremely strong and now extend lower for greater comfort and increased protection. 2. Non-Marking Grip-Strip on any surface. 3. 1/2 inch closed cell inner foam pad offers the ultimate in comfort and protection. 4. Speed clips snap easily into place for quick on-off. 5. Hinged with METAL RIVET for ease of movement while kneeling or walking. 6. Soft elastic woven straps with reinforced sewn ends are placed well above and below the knee - will not bind behind knee. Easy Attachment.