Lack Of Traction And Lack Of Comfort Are Arguably The Two Biggest Complaints From Runners When It Comes To Shoes. With These, You Don't Have To Worry About Either. First, You Can Count On Pumagrip For All-Surface Traction No Matter What. Second, As Far As Comfort Is Concerned, These Shoes Boast Nitro Foam Combined With Profoam, Which Together Provide Amazing Responsiveness And The Cushioning You Need On Every Stride. Ideal For Beginners And Expert Runners Alike.