G-Form, known for its low-profile, fit-like-a-glove knee and elbow pads, has a new and tougher option for mountain bikers called the E-Line. Need a Reason to Wear Pads When Mountain Biking? Here are 9. We asked readers if they have ever had a ride, or maybe a knee, saved by wearing pads, and they had some insightful dirtnap narratives to share.