The Alpine bivi is a minimalist, single-person waterproof bivi, designed for use on lightweight alpine expeditions and summit attempts.
Rab says:
Made using a durable and breathable eVent® DVStorm 3L fabric, the Alpine Bivi will appeal to those who are looking for maximum performance and a slightly larger capacity balanced with a smaller pack size.
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eVent Waterproof Fabrics use Direct Venting Technology - a proprietary and patented waterproof membrane allows millions of tiny pores to breathe at their full potential. Sweat vents directly to the outside of the fabric in one easy step. Click Logo to read more..
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Achieves a very low weight by minimalist design and by using 15 Denier fabric - so not as durable as a heavier bivi bag but one of the lightest eVent bivis around.