What Our Gearhead(R) Experts Are Saying:"These liners give me peace of mind on the trail without feeling bulky. The SmartFlex pads flex as I move but harden on impact, providing solid hip protection when I need it. The breathable mesh keeps things cool, and the grippers ensure everything stays in place-even on rough terrain."When we need impact protection without extra bulk, the X4 Men's Short Liners deliver. With SmartFlex technology, these liners provide seamless, flexible protection that hardens on impact, shielding our hips from unexpected crashes. Designed with 4-way stretch mesh panels, these compression-fit liners keep us cool and comfortable while riding. The chamois insert adds cushioning for long days in the saddle, while the gripper-lined interior leg hem ensures the shorts stay in place. Whether hitting technical trails, all-mountain terrain, or cross-country rides, these liners give us the confidence to push harder.