Gore-Tex is a unique tissue paper thin microporous membrane, which contains over 9 million pores per square inch. Each pore is 20,000 times smaller than a water droplet, yet some 700 times bigger than a moisture vapour molecule. This gives the fabric excellent levels of waterproofness and breathability.
The outer face of the Gore-Tex fabric is coated with a hydrophobic DWR (Durable Water Repellency) treatment which encourages surface water to bead up and run off. This improves the wet weather performance of the garment and promotes breathability by preventing wetting-out of the outer face.
The Survival Zone is a very light weight bivi made from waterproof seam-sealed Hyperlite Storm fabric to create a waterproof and breathable bag. It features a drawcord at the head allowing the hole to be closed around the face but still allowing ventilation. This is not the most durable bag but it's certainly among the lightest 'proper' bivy bags available, at around half the weight (and cost!) of a Gore-Tex bag it's an excellent choice for climbers.
|Rab||Survival Zone||370g||Pertex Shield||253 x 87 cm||RBR: 5|
|Rab||Alpine Bivi||496g||eVent||235 x 90 x 30 cm||RBR: 9|
|Rab||Ascent Bivi||611g||eVent||235 x 80 x 30 cm||RBR: 8|
|Rab||Storm Bivi||664g||Hyperlite Storm||235 x 80 x 20 cm||n/a|
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