BIG WALL HOOPED BIVY. Super lightweight and packable. Mesh zipper helps a lot with condensation when in freezing temps. A waterproof bivy sack with an integrated, waterproof tie-inpoint, the Big Wall Hooped Bivy is ideal for sleeping through bad weather on the wall. Sewn-in flexible wire creates air space. Dual-sided zipper and mesh covered opening. RF welded tie-in point for secure anchoring. [Long] 870 g, (1 lb 14 oz). [Long] 251 x 89 cm (99 x 35in). [Long] 15 x 33 cm (6 x 13 in).