Runs smooth. Feels amazing. Every bit of the Guide 15 was designed with three things in mind: total comfort, a light feel, and an unbelievably smooth ride. It’s softer, it’s springier, and it’s made to hug your foot like nothing else you’ve put on before. Delivering the running experience of your dreams, only it’s very, very real. Features And Benefits Lighter and smoother every step of the way. With a softer, lighter PWRRUN formula and more midsole beveling, you get a thicker stack of cushioning and an incredibly smooth ride from heel to toe. Support that lets you fly. HOLLOW-TECH gives you the underfoot support you need, but in a lightweight and minimalistic way. Fits just right. By carving out the midsole and creating a deeper footbed, you sit into the shoe, instead of on top of it, for an incredibly supportive fit.