Flex Rating: 6 (1 Soft - 10 Stiff) – A stiff flex perfect for charging all over the mountain.

Easy In – Easier and faster to get in. Featuring a gliding patch that is placed at the entrance of the liner for heel glide and easier entry

Fusion Liner – F boots exclusive: engineered for the Fusion line, this LCG, Low Center of Gravity, Fusion liner is the secrete behind the unique connection between the liner and the upper. Taking advantages of Exhale technologies such as mesh channels and one-way valves flush out humidity by using the natural motion of your feet to circulate and channel air out of your liner and boot. The result: the best contact and board feel on the outside while keeping it dry on the inside = best riding day

Heel Grip – Specific Cat-Tongue material around the heel, so your socks are perfectly gripped into the boots for a comfortable increased heel-hold.

Exhale Liner

WrapLock – Three power panels and a fused liner form to your foot in one single pull of the lace. In one motion your foot is wrapped in a low-profile, running shoe inspired boot.

Mystic 2 – This Bamboo antimicrobial footbed is designed to increase blood circulation, prevent rider fatigue and encourage muscle recovery from the bottom of your feet to the top of your head.

Self Gel Auto Fit – A fusion exclusive. Dynamic fit foam that conforms to the shape of your foot throughout the day. As your foot changes (and it does) the foam changes. Self Gel uses this foam throughout the ankle area of the liner.

Flight Outsole – The F4's freestyle lil' sister now benefits from its new outsole technology: the Flight. Highligts of the best developments on this outsole include: grip, flexibility and sleekness. Freestyle tech at its best.

Breathable Valve – Jumping, landing, jibbing and walking all generate internal air pressure from the compounds of your liner. Left in the boot, this air pressure will break down your liner and decrease comfort. Fusion boots feature a one-way breathable valve to exhaust old air, while keeping moisture out.