Details Sea to Summit Premium Stretch Knit Expander Liner - Traveller (with Pillow slip) - Green The Sea to Summit Expander liner is constructed of a quality stretch knit polycotton, which makes it even stretchier and warmer than an ordinary cotton weave liner. The stretchy fabric of the Expander Liner allows it to move with you while you sleep, greatly boosting comfort and reducing tangles. The anti-microbial treatment keeps bacteria at bay while also extending the life of your sleeping bag and liner. The anti-microbial treatment will not wash out of the liner and does not use nano-sized particles. This is a liner designed for travel, with a roomy rectangular shape and built in pillow slip. Premium stretch knit fabric can expand to twice its width Exceptionally comfortable Keeps your sleeping bag clean Anti-microbial protection keeps your liner fresh, hygienic, and odour-free Machine washable Specifications Expander Liner - Traveller (with Pillow slip) - Green