100% Synthetic Imported Rubber sole Long distance comfort : The compound of this midsole maintains its comfort, cushioning and rebound over the distance of an ultra. It won’t compress or collapse. Dynamic ride : The energy save midsole with a rolling profile, keeps you flowing down the trail. A breaking zone in the sole helps maintain confidence on the descent. Adjustable foothold : The Sensifit has floating wings that make it easy to adjust the forefoot and midfoot support as your needs change throughout a long event. They also provide added protection.