10 Best Sleeping Bag Liners 2025 in the United States

The Litume All Season Fleece Sleeping Bag Liner is a cozy option designed to boost warmth by up to 27°F (15°C), which can make a big difference for colder nights while camping or backpacking. Its soft polyester fleece material feels comfortable against the skin and includes a mummy shape with a drawstring hood to trap heat efficiently. At about 85 inches long and 32 inches wide, it fits most adults up to 7 feet tall, offering good space without being bulky.

The Sea to Summit Reactor Sleeping Bag Liner in Extreme Standard size (85 x 31.5 inches) is designed to add significant warmth—up to 25°F—to your existing sleeping bag, making it a solid choice for winter campers or anyone facing cold conditions. It uses advanced Thermolite Pro fabric, which is lightweight yet insulated, thanks to hollow fibers that reflect body heat back to you. This material also stretches well, allowing good freedom of movement inside mummy-shaped sleeping bags.

The Browint Silk Sleeping Bag Liner is crafted from 100% natural Mulberry silk, known for its smooth, soft feel that won't irritate sensitive skin. Its silk material helps keep you cool in warm weather, making it ideal for spring, summer, and early fall camping or travel. Measuring an extra-wide 87 by 43 inches, this liner offers more room than typical single liners, which is great if you like to move around while sleeping or are taller. Despite its size, it remains very lightweight at just 6.3 ounces, and it packs down small into a handy carry bag with a hook, making it easy to transport.