Adding a Tempest RS Brolly Skull Cap to your Tempest RS shelter greatly enhances its performance. It adds additional length to the peak, providing more coverage in and around the door area. This Bivvy Accessoryalso creates shade, greatly cooling your shelter in the warmest months. The dual-layer coverage improves insulation, greatly reducing the chance of condensation. Manufactured from enhanced Aquatexx™, this multi-layer fabric offers superior water repellency, breathability, and black-out pigment. The RS version features improved guttering and two magnetic rod straps.