The 2021 Nitro Thunder TLS boot delivers a mid-flex all mountain freestyle boots. This boot is great for anyone who wants a forgiving boot in the park or someone who is beginning to step up their game. The TLS twin lacing system allows you to independently tighten the upper and lower laces for perfect tension and comfort. The cloud 3 liner provided support and comfort for all day riding. The Nitro thunder is a great boot backed with all the tech without breaking the bank.