Polartec Alpha Direct Quilt Liner

Polartec Alpha Direct does something most insulation can’t — it actively regulates temperature instead of just trapping heat. Built with the same technology trusted by mountain guides and ultralight thru-hikers, it breathes when you run warm and insulates when you don’t — so you stop waking up sweaty at 2 am. Whether you’re pushing your sleeping bag into shoulder-season territory or heading out on a warm-weather overnight with nothing but this, it’s the layer that earns its weight. What makes it different Polartec Alpha Direct skips the shell fabric entirely — the insulation is the surface, designed to sit directly against your skin. That means less bulk, faster drying, and a next-to-skin softness you won’t find in a standard sleeping bag liner. Unlike other fabrics that go clammy when temperatures and humidity climb, Alpha Direct stays soft and dry against your skin — no sticking, no cling, no matter how muggy it gets. Use it as a standalone summer quilt on warm nights, a versatile camping liner for any sleep system, or a packable backpacking liner that pulls its weight on thru-hikes, weekend trips, and nights at home alike. Trail Tested. Couch Approved. How to use it As a sleeping bag liner: Adds 5–15°F to any 3-season bag, extending your system deep into shoulder season As a quilt liner: Pairs with any backpacking quilt to extend its warmth range without the bulk of a heavier bag As a summer quilt: Standalone warmth rated to 50–60°F — ultralight, packable, ready for warm-weather camping For backpacking and thru-hiking: At 8–12 oz, it earns every gram without adding bulk to your kit Choose your weight Model Weight Standalone Comfort As a Liner Adds Alpha Direct 90 8 oz ~60°F 5–10°F Alpha Trail 90* 8 oz ~60°F 5–10°F Alpha Direct 120 12 oz ~50°F 10–15°F *Alpha Trail 90 features two-way stretch and packs even smaller than the Alpha Direct 90. Specs Material: Polartec Alpha Direct Fleece Dimensions: 72" long × 55" wide Foot box: 15" circular, sewn-in Packed size: 10" long × 4" diameter cylinder Made in Pennsylvania 🇺🇸 Want to push your liner into shoulder-season territory? Add the Windproof Shell — 2.9 oz of Argon 67 that blocks wind and light moisture, extends your effective warmth range by several degrees, and packs down to nothing. Want that warmth-and-wind combo in one sewn quilt? The Wind Gap Alpha sews Alpha Direct to an Ion 1.1 windproof shell — a windproof liner, 50°F top quilt, or hammock underquilt in a single piece. ⚠️ These sell out as fast as we make them. Place a backorder now to reserve yours from the next production run — we’ll ship it the moment it’s ready.