Breathable mesh upper: Heel pull tabs make this shoe easier to take on and off: Midsole foam: Provides soft cushioning with a responsive rebound. Half-bootie heel collar design: Description The VERSABLAST 2 shoe is a versatile training partner for varied workouts and running regimens. Inspired by our NOVABLAST shoe series, we wanted to make this shoe softer and lighter. It’s designed to provide good comfort for a range of activities. By focusing on the shoe’s energy return, we created a more responsive rebound for a fast feel underfoot. Sz 13