Enhance energy efficiency with the Velux Insulation Collar. This collar fits seamlessly between your roof window and roof construction, minimizing thermal bridges and improving insulation. It's perfect for maintaining indoor temperatures and reducing energy costs, making your home more comfortable and eco-friendly. The Velux Insulation Collar provides an optimal fit for single roof window installations, creating a strong barrier against heat loss. Easy to install and highly effective, it's essential for any energy-efficient home improvement project. The insulation collar is for use with EDL, EDP, and EDW flashings and includes a BFX underfelt collar for additional weathertightness. It reduces heat loss and eliminates cold bridges, ensuring a flexible and tight seal and minimizing the risk of condensation for maximum energy efficiency. For Window Type: MK06. Product dimensions: 780 x 1178mm.