The Kaiju 14/15 Boots from Nike Snowboarding Synthetic upper with flex notches for a comfortable fit External TPU backstay for support & durability Flywire webbing lace system with neoprene eyestays & a flex notch for quick tightening & lightweight support Nike Free-inspired rubber outsole for durable traction & flexibility Phylon midsole with Zoom Air heel unit for lightweight, low-profile cushioning The Nike Zoom Kaiju Men's Snowboarding Boot is made with flexible traction inspired by Nike Free technology for natural range of motion on the mountain. A Flywire lacing system delivers lightweight support & customized lockdown, & an external backstay provides responsive rebound for stability during takeoffs & landings.