The UA HOVR ™ Sonic is the go-to choice for runners who love distance but don't want to give up on superior flexibility. And now, thanks to UA MapMyRun ™ 's real – time Form Coaching feature, the UA HOVR ™ Sonic 4 can also help you become a better runner. UA HOVR ™ technology provides a "weightless" feeling, promoting energy return and reducing the force of impact on the ground. Removable midsole adapts to the shape of the foot for personalized comfort and cushioning Blown rubber under the forefoot and highly abrasion resistant rubber under the heel to help absorb ground contact. Color: White.