If you're reading this, there's a good chance your knees already give you some kind of problems. After years of having fun, that's just the name of the game. Preserve what you've got left from an untimely tarmac tear- up with the Field Armor 3 Knee. Vented bio-foam and air mesh chassis are paired to articulating injection molded shell with airflow channels, so comfortable it's easy to forget you're wearing them at all. Low profile, the design fits under most pants while the 3 stretch adjustment straps keep the protector securely in place. The D3O impact protectors do the heavy lifting. Wear them and keep your knees another day.