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Advanced Bivy

Outdoor Research Advanced Bivy

$319.95

5 5 (16)

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Alpine Bivy

Outdoor Research Alpine Bivy

$239.95

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Choosing Bivy Sacks

A bivy sack is a low-profile, waterproof barrier for your sleeping bag that offers an ultra-lightweight alternative to traditional tents. Originally used by climbers who needed lightweight, compact shelters for multi-day ascents, they are also popular among backcountry minimalists who want to shave weight. They don't offer room to move, but they're easy to pack.

Structured Bivy Sacks
Structured bivy sacks, called bivy shelters, have small suspension systems that expand the head area to provide some room to sit up in. This makes the confined space more comfortable fit.
Related Content Leave Your Tent Behind: Alternatives to Traditional Camping
Bivy Openings
The most basic bivy sacks have an opening at the head to let you breathe and allow moisture to escape. More advanced models use mesh panels to keep bugs out.
Related Content How to Choose the Right Camping Sleep System
Bivy Fabrics
Most bivy sacks use two different fabrics to balance protection and weight. The bottom fabric is heavier for durability. The upper fabric is usually lighter and features a waterproof/breathable laminate.
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How to Buy an Alpine Touring Boot

Free Your Feet From the Resort

Traditionally, a ski boot was designed for going downhill with as much speed and power as possible, with little thought to the comfort when going uphill. With an aggressive sole material like Vibram, lightweight shell material, and the now-standard lever to switch between walk and ski modes (to free the cuff to rotate or lock it in place), the alpine touring boot changed everything. This is the boot to take into the backcountry.

Binding Compatibility:

An alpine touring boot is either compatible with a standard alpine ski binding (DIN normalized binding), a TECH binding, or both. There’s little difference between the boots except for the extra heel and toe fittings required for a boot to be TECH compatible.

Flex Rating:

A stiff boot will have a high flex rating (120-130+), while a softer boot will have a lower flex rating (100-110). Stiffness benefits you during the descent, but it might cause you pain on the skin track—consider whether you prefer superior comfort or performance.

Weight:

A carbon cuff or tongue, lightweight plastic shell, minimalist buckle design, or honeycomb structure help reduce the weight of an AT boot so you can move faster and feel less fatigued during a long tour.