The Ultralight Polar Fleece Sleeping Bag Liner is the versatile sleep companion that earns its place in every pack. Crafted from soft polar fleece, this mummy-style liner keeps you warm in temperatures above 15°C when used alone — and adds a meaningful warmth boost when slipped inside a heavier sleeping bag for colder conditions. At 180 × 80 cm, it fits adults comfortably up to 1.8 m tall. The splicing zipper lets you connect two liners for a double configuration, and the ultra-lightweight construction means it adds almost nothing to your pack weight. Whether you’re camping, travelling, or using it as a hotel sheet liner, this fleece bag delivers comfort without compromise. Specifications Specification Detail Style Mummy Material Polar Fleece Temperature Rating Above 15°C (standalone use) Season Spring, Autumn, Mild Winter (as liner) Size 180 × 80 cm Suitable Height Up to 1.8 m Splicing Yes – single or double configuration Applicable Users Adults Available Colors Multiple (Blue, Green, Gray, Coffee, Wine Red) Why Choose This Polar Fleece Liner? Dual-Purpose Use: Works as a standalone sleeping bag in mild weather or as a liner inside another bag to extend its temperature rating — one piece of gear, two critical functions. Soft Polar Fleece: Exceptionally soft against skin, breathable, and quick-drying — far more comfortable than synthetic liners for extended use. Ultralight Construction: Adds minimal weight to your pack — i for ultralight backpackers and travellers who count every gram. Mummy Shape: Contoured design reduces dead air space and keeps the liner in place throughout the night. Splicing Compatible: Connect two liners for a double configuration — useful for couples or anyone who wants extra room. I For Spring and autumn camping trips Travel and hotel use as a hygienic sheet liner Boosting warmth inside a heavier sleeping bag Ultralight backpackers in mild conditions Outdoor activities where a full sleeping bag is overkill In the Box 1 × Polar Fleece Sleeping Bag Liner 1 × Carry/storage bag