Bastion 10°F Sleeping Bag

Most sleeping bags trap the moisture your body gives off, leaving you cold and clammy by morning. The Bastion does the opposite. Made with proprietary Keloflex™, it pulls breath, sweat, and condensation away, so you stay dry and your temperature holds steady all night.

It's also the most adaptable bag we've built.

One bag, or two. Sleeping solo? Slide one foot pocket into the other for double the insulation underfoot, because no one sleeps well with cold feet. Sleeping out with a partner? Slide the foot pockets of one Bastion into a GameChanger or a second Bastion, and the two combine into a full two-person system. No zippers, no fuss.

Head-in warmth that doesn't fight you. Tuck fully inside for true head-to-toe heat. In an ordinary bag, breathing inside dampens the insulation and saps its warmth. Keloflex™ pushes that breath moisture out instead, so tucking in keeps you warm.

What you wear matters. The Bastion keeps you dry by pulling moisture off your body and out of the bag, so what you sleep in either helps or fights it. Cotton is the biggest culprit: it soaks up moisture and holds it against your skin, and spandex has a cooling effect, which is counterproductive. Sleep in synthetic or merino wool base layers instead, and keep cotton and spandex out of the bag. It's a small choice that makes a big difference in how comfortable the whole system keeps you.

What matters:

• Dual foot pockets. Double the insulation underfoot when solo, or join two bags into a two-person system.
• Head-in heat retention. Tuck fully inside for head-to-toe warmth without the cold, damp breath problem of ordinary bags.
• Moisture managed, not trapped. Keloflex™ moves breath, sweat, and condensation away so your insulation stays dry.
• Rated to 10°F (-12°C). Built for serious cold-weather and preparedness use.
• Steady overnight comfort. Regulates body heat as outdoor conditions shift.
• No zippers. A cleaner, more durable design with nothing to snag, jam, or fail.
• Built with proprietary Keloflex™. Engineered for next-generation performance.
• Made to last. Durable enough to perform season after season.
• 100% Risk-Free Satisfaction Guarantee. Try it with nothing to lose.