A stretchy, unrestrictive polycotton liner that lets you sleep easily all night long.Made using premium stretch knit polycotton, the Sea To Summit Stretch Knit Expander Liner is super-stretchy, and warmer than a standard cotton weave liner. It moves with you as you sleep, minimising tangles to increase your comfort. The anti-microbial treatment keeps bacteria at bay, prolonging the life of your liner and sleeping bag.Anti-microbial treatment EPA (USA) approvedStretch knit fabric can expand to twice its widthLuxuriously comfortableEasy care, machine washableLength/Width: 185 x 92cm Weight: 310g Sea to Summit\'s anti-microbial treatment prevents mould or fungal growth inside. While you can always use a pump, the anti-microbial treatment means you can go ultra-light and inflate with your breath.