The Thermo Liner Pro 5mm Special Edition is the slimmest of the Pro series — a glass-fibre reinforced aluminium foil bonded to a premium soft closed-cell foam. At only 5mm it fits into tight panel cavities and behind fittings where a thicker liner won't go, while still reflecting radiant heat and absorbing residual acoustic energy. The reinforced foil resists tearing during installation, making it easier to handle in awkward spaces.