Technical Data Heat Reflection - The solar control coating and subtle tint in SMARTGLASS^TM  reflects over 70%* of the suns radiant heat during the summer months, dramatically reducing the uncomfortable temperature build ups that have blighted conservatory design over the years. Reduced Glare -  By filtering out strong sunlight and harmful UV rays light transmission is reduced, yet an open and airy feel is retained. In cutting out over 60% of visible light, the uncomfortable brightness of the summer sun is greatly moderated. Soundproofing - Made from two leaves of 4mm toughened safety glass, the rigid unit construction offers twice the soundproofing of standard roofing products such as polycarbonate. *or why not ask about an upgrade to Smartglass 4S for even better performance