Design: Higher level of support allows your more stability in your stance; a combination of tuned support and intentionally placed cushioning helps you feel secure in these training shoes during every step Classic laces In-Shoe Comfort: Foam midsole with a visible Max Air unit at the heel offers a high level of cushioning for your foot during impact Max Air unit in the heel has been fine-tuned for even better stability Foam collar pads your ankle Durability & Traction: Flat, wide sole with an optimal rubber tread pattern gives you stability and traction Flex grooves in the forefoot allow you to move naturally and are designed for lunges Rubber wraps up the side to help keep your foot firmly on the sole during lateral movement