Transform your Tempest Advanced 150 into a twin-skin shelter with the Skull Cap Wrap which works to reduce condensation and offers extra protection from the elements by creating a peak. Its extended sides and rear provide full top-to-bottom twin-skin coverage. The Tempest Advanced 150 Skull Cap Wrap can be easily fitted in seconds via spigot system on the three front poles and is then simply pegged down around the bivvy with the back vents allowing you to keep air flowing through your shelter in warmer weather where the Skull Cap Wrap will also act to keep things cooler in the bivvy. Featuring dual rod straps for convenient, safe placement of rods and rain gutter.