The Alitherm 500 window system incorporates Smart’s innovative polyamide thermal break technology, which creates a barrier between the cold air outside and warm air inside. This technology significantly reduces thermal transmittance and enhances the overall U Value of the product. Alitherm 500 is available in a choice of standard and non-standard colours, with single and dual colour options including Smart’s own Naturals, Sensations, Alchemy and Cotswold colour ranges.