Sea to Summit Sleeping Bag Liner

While it varies based on your specific sleeping bag and conditions, the Thermolite blend provides a noticeable thermal boost, making it a great option for extending the temperature range of your existing sleep system on cooler nights.

Yes, Sea to Summit offers this liner in multiple shapes, including a mummy-specific cut designed to contour to the shape of technical sleeping bags without excess material bunching up.

Not at all. The liner is fully machine washable, making it easy to refresh after a trip. Its antimicrobial treatment also helps manage odors during extended use.

The liner features a dedicated pocket at the top where you can insert your own pillow or a stuff sack filled with clothes. This keeps your pillow securely in place and adds a layer of hygiene between you and hostel or hotel bedding.

The fabric is designed with a stretch component, which allows for natural movement while you sleep. It won't feel like you are trapped in a tight sack, even in the mummy-shaped version.

It is highly packable, weighing only 6.3 ounces and compressing down to about 5 inches in length. It is designed to be a minimal addition to your gear, easily fitting into the side pocket of most backpacks.