Big Agnes Alpha Direct Fleece Sleeping Bag Liner – Polartec® Alpha™ Direct Warmth-Boosting Liner

Big Agnes Alpha Direct Fleece Sleeping Bag Liner – $67.48 Sale (Save $82.47)

The Big Agnes Alpha Direct Fleece Sleeping Bag Liner wraps you in soft, cozy Polartec® Alpha™ Direct warmth wherever your overnights take you. Perfect for backpackers, car campers, and travelers upgrading their sleep system, it's priced at $67.48 – a 55% discount off $149.95. Buy online at Trek Haul Outfitters, apply coupon SAVE15 for an extra 15% off, and get free shipping on orders over $45.

Temperature Rating and Warmth Added

Polartec® Alpha™ Direct is a lightweight, breathable active-insulation fleece that adds measurable warmth to your existing sleeping bag or quilt – typically several degrees of comfort boost depending on conditions. Because it's breathable, it regulates heat instead of causing clamminess, making it ideal for shoulder-season trips and cold sleepers.

Materials

Premium Polartec® Alpha™ Direct fleece delivers a cozy, premium sleep experience while staying surprisingly light. The fabric packs down small, slipping easily into a carry-on, car camping kit, or backpack.

Functions and Sleep System Compatibility

• Adds warmth inside any mummy or rectangular sleeping bag
• Boosts the comfort range of quilts like the Fly Creek UL or camp quillows
• Protects your bag's interior from dirt, odor, and body oils – extending bag life
• Use it alone as a warm-weather sheet or hostel/travel liner

Can You Use the Liner Alone?

Yes. In warm summer conditions the Alpha Direct liner works as a standalone sleep layer, replacing a heavy bag and cutting pack weight – one reason it's a favorite two-for-one value buy.

How to Wash Your Alpha Direct Liner

Machine wash cold on a gentle cycle with technical-fabric detergent and tumble dry low or air dry. Avoid fabric softeners to preserve the loft and breathability of the Alpha Direct fleece.

Liner vs Bag Comparison

Compared with buying a warmer sleeping bag, adding this liner costs far less and works across multiple bags and seasons. At $67.48 sale pricing, it's the most affordable warmth upgrade per dollar in the sleep system category.

Deal Value

Save $82.47 instantly off the $149.95 compare-at price, then stack SAVE15 for another 15% off. Free shipping applies over $45 – order today at this sale price.