H4 Single Frame Shell™
Patented Union Design
Engineered with Pebax®, this lightweight and durable shell offers waterproof protection and consistent flex that holds up through the full life of the boot.
Forma Pro Liner
Featuring TrueFoam™ Technology
This custom-built memory foam liner features TrueFoam™ Technology, molding to any foot right out of the box—no break-in, no pack out, just lasting comfort.
Contact Footbed
3D-Formed Dual-Density Ortholite™ Foam
3D-formed dual-density Ortholite™ footbeds with 5% recycled rubber provide lasting comfort, impact absorption, and performance ride after ride.
Rebound Bushing™
Lightweight Cushioning
A responsive layer of rebounding foam under the heel and toe absorbs impacts, reduces vibrations, and fights foot fatigue without ever losing shape.
Vibram® SD Midsole
Enhanced Shock Absorption
Engineered by Vibram®, the SD midsole fuses lightweight EVA with shock-dispersion tech, delivering durable cushioning and high energy return for performance that lasts.
Vibram® XS Trek Evo Outsole
Multisurface Grip with Traction Lug
Engineered for stability, comfort, and durability. With multisurface grip, Traction Lugs, and premium rubber compounds, this outsole delivers confident traction on snow, ice, and hard terrain, season after season.
Dual Zone BOA®
High-Power Dial Activated Fit System
Dual Zone BOA® provides two micro-adjustable zones—upper for flex and stability, lower for response and control.