Zoom Airlocated in the heel and forefoot consists of low-profile pressurized air pockets that flex on contact for responsive cushioning.Phylonis a full-length midsole foam that delivers lightweight, resilient cushioning.Crash padat the bottom of the heel is a decoupled, gender-specific unit that reduces impact shock. The Nike Zoom Terra Kiger 4 is a versatile performance trail running shoe that can handle a variety of trail running conditions.