The Mechanics of Internal Barrier Films

Winter moisture comes in two forms: melting slush from the outside and perspiration from the inside. A standard knit glove absorbs the wet slush, while a rubber glove traps sweat until your hands turn clammy and cold. A TPU membrane solves both problems simultaneously.

How the Barrier Operates

Thermoplastic polyurethane is a thin, elastic film laminated between the softshell outer and the fleece lining. Its molecular structure prevents liquid water droplets from penetrating inward, while permitting evaporated sweat molecules to vent outward.

• Waterproof rating: Hydrostatic head testing ensures the film resists water penetration under sustained pressure from gripping wet steering wheels or bicycle handlebars.
• Wind resistance: The solid microscopic matrix halts icy gusts completely, preserving the pocket of warm air trapped in the microfleece.
• Flexibility: Unlike stiff PVC laminates, TPU moves naturally with your knuckle joints without creaking or stiffening in hard freezes.

Why We Pair TPU with Microfleece

When the TPU layer stops the wind, the brushed microfleece lining can do its job efficiently. Hands stay warm because cold air cannot sweep past the insulation, and fingers stay dry throughout long winter afternoons.