The Cromar Vent 3 High Performance Breathable Membrane is a high-quality, grey roofing underlay designed to enhance the longevity and performance of your roof. Manufactured by Cromar, this product is renowned for its exceptional water resistance and breathability, providing optimal ventilation to prevent condensation build-up. Measuring 50M x 1M, its ideal for both commercial and residential use. With easy installation procedures and enhanced UV stability, it guarantees reliable performance even in harsh weather conditions.