Trakker Tempest Brolly 100 Skull CapTrakker Tempest Brolly 100 Skull Cap Create a peak to the front of your Tempest giving greater protection from the rain without compromising your view of the lake by using the Tempest Composite Brolly Skull Cap. Not only will the Skull Cap give additional protection from the weather, it also adds a second skin to the top of the shelter which combats condensation and retains heat and unlike a full overwrap, it can be left in place when the bivvy is