Alpha Direct insulation works by trapping a layer of warm air close to your body. Wind destroys that layer in seconds. This 2.9 oz shell stops that from happening — and at that weight, there’s no reason to leave home without it.

What it does

The Windproof Shell wraps your Alpha Direct Quilt Liner in a breathable Argon 67 shell that blocks wind and sheds light moisture without trapping heat. The result: the shell locks in the microclimate your Alpha Direct liner creates, and you sleep warmer than the temperature rating would suggest. It’s also a capable standalone layer on mild nights when you want weather protection without full insulation.

The sewn-in circular foot box — same 15" diameter as your liner — keeps everything aligned and gives you easy access for ventilation without letting cold air creep in from the bottom.

How to use it

• Over your Alpha Direct liner: Extends effective warmth by several degrees — turns your summer quilt into a legitimate shoulder-season system
• As a standalone shell: Use it on warm nights when you want wind protection without the weight of a full insulated layer
• For mixed-forecast trips: One shell, packed in seconds, changes what your sleep system can handle

Which liner should I pair this with?

The Windproof Shell fits all three Jacks R Better Alpha Direct liners — same 72" × 55" dimensions, same 15" foot box. The right pairing depends on your conditions:

• Trail 90 or Alpha Direct 90 + Shell: Your go-to warm-weather setup. The liner handles nights down to ~60°F on its own — add the shell when wind or light rain is in the forecast and you’ll stay comfortable well below that without carrying a heavier bag
• Alpha Direct 120 + Shell: A capable shoulder-season system. The 120 already pushes standalone comfort to ~50°F — wrap it in the shell and you’ve got a legitimate 3-season setup at a fraction of the weight of a traditional sleeping bag

Not sure which liner to start with? The Alpha Direct Quilt Liner page breaks down all three options side by side.

Prefer the liner-and-shell idea sewn into a single quilt? The Wind Gap Alpha sews Alpha Direct and an Ion 1.1 windproof shell into one piece — a windproof liner, 50°F top quilt, or hammock underquilt, with no separate shell to line up.

Specs

• Material: Argon 67 (windproof, breathable, water-resistant)
• Dimensions: 72" long × 55" wide
• Foot box: 15" circular, sewn-in
• Weight: 2.9 oz
• Available in: Black, Dark Olive, Moroccan Blue
• Made in Pennsylvania 🇺🇸

Designed specifically for the Jacks R Better Alpha Direct Quilt Liner/Summer Blanket. Dimensions match — it fits the way it should.