Flex Rating – 8 - 9 (1 Soft - 10 Stiff)

Power Tongue Stiffener – For those looking for adjustable stiffness throughout the day or season, you can use the removable tongue stiffener to change between premium precision or more of a relaxed feel. From the steep and deep to the groomers, you can customize your boot feel perfect for your style.

Armored Spine – Nitro uses an anatomically-shaped and 3D-molded heel reinforcement to provide even boot flex and long-lasting heel fit.

Flex Link Design – A flexible panel at the ankle between the upper and lower shell ensures an even-flexing, responsive boot without bulk.

Internal Ankle Support – An anatomically shaped molded plate distributes lace pressure over the instep and top ankle area. Resulting in more comfort and a better, more precise fit.

Cloud 9 Liner – Ultra-lightweight pre-molded Thermacell material creates a straight out of the box fit with unstoppable comfort. Nitro's signature latex heel pads provide lifetime heel fit, while the clutch tongue makes boot entry and exit easier.

ILS Liner Lacing – The ILS system uses a lacing harness to snugly wrap around the liner and secure it in the shell for a precise fit. Engineered ILS laces provide less friction and have a Dyneema® core for added strength.

RE/LACE Liner Locker – From the innovators at Nitro R&D comes the RE/LACE liner locker, providing easy adjustment of your inner boot lacing without having to untie your boot.

Dual Zone BOA Fit System – This zonal fit system allows for a precise fit and tailored foothold. The system can be loosened or tightened effortlessly with the turn of the two BOA dials.

Bail Out System – Designed to make unlacing the TLS system even easier. This pull tab placed in the middle of the TLS lacing system on the outside of the boot allows for effortless unlacing and record breaking speeds for taking your boots off.

EVA Midsole – Used on all boots with rubber outsoles, the EVA midsole reduces the overall weight and provides cushioning and thermal insulation.

Ortholite® High Cup Triple Density Footbed with O-Therm™ – The world's leading supplier of open-cell foam insole technology provides a triple density footbed for support and comfort with an anti-microbial, moisture-wicking technology for drier, less odorous experience.

Step On® Rubber Sole – A highly effective traction pattern, combined with an abrasion-resistant high-grip rubber compound provides additional sole durability and a perfect grip, no matter if you‘re hiking up the park or down the stairs to the bathroom...

Therminator Shield – This thermal layer between sole and liner will reflect your body heat and keep your feet warm all day.