The Nash Blockhouse maximises usable space and headroom and gives the angler sealed capsule protection in a bivvy that erects in seconds. The Blockhouse frame simply folds out, clicking into place through the Speed Up joints, with not one pole to assemble. Inside there is room to stand, wash, change clothes and deal with poor conditions that can be challenging in less roomy shelters. The Extreme HD groundsheet system is secured all around the internal skirt of the Blockhouse for an effective barrier and sealed inner capsule.