Borah Gear Cuben Bivy

The Borah Gear Cuben Bivy is a minimalist ultralight bivy pairing a waterproof Dyneema Composite Fabric floor with a breathable Argon67 nylon top - the floor keeps ground moisture out while the breathable top lets vapor escape so the sleeping bag doesn't wet out from condensation. In its lightest configuration (regular size, chest zip), it weighs approximately 120 g, a typical figure for DCF bivies at the upper end of the ultralight category. Dimensions of 213 x 76 cm fit a standard-length sleeping bag, and the 3/4 chest zip makes entry and ventilation easier without unzipping the full length. A full-length bug net is an above-average detail at this weight - most bivies in this weight class either skip it entirely or offer only limited head-area protection. It works as a tarp companion or a standalone shelter for solo ultralight treks, where the trade-off for weight near 120 g is minimal interior room and no freestanding structure. It is not a tent replacement in sustained rain.