Sleeping bag liners are an under-utilised and under-appreciated piece of outdoor kit. But if you want to get the most from your sleeping bag, you need to get one. Here are three reasons you should get a liner, plus four of the best to buy.

1. A sleeping bag liner is a line of defence between your body and your sleeping bag’s loft. If oils from your skin and sweat get into the down, unless you’re prepared to wash your sleeping bag regularly, you end up losing loft power.

2. Compared to a sleeping bag, a liner is easy to clean at home and is quick-drying.

3. They are a cheap and lightweight way to boost the warmth of your sleeping bag – some liners add up to 14-degrees. 

Still not convinced? Read our story The lowdown on sleeping bag liners. Or scroll down to see some of this year’s best options.

Sea to Summit Reactor Liner Thermolite $99.99
Adds up to 8°C of warmth to a sleeping bag or can be used alone as a warm-weather bag. Mummy shape with a box foot, drawcord hood, machine washable. 248g. www.southernapproach.co.nz

Rab Poly Cotton Liner $59.95
Rectangular liner, adds comfort and warmth, protects sleeping bags, stuff sack, easy to wash. 350g. www.outfitters.net.nz

Macpac Silk Sleeping Bag Liner $119.99
Silk fabric is soft and smooth on the skin, wide opening, stuff sack included. 105g. www.macpac.co.nz

Rab Thermic Neutrino Liner $69.95
Adds warmth, tapered shape, microfleece fabric. Fits Rab Neutrino and Neutrino Pro sleeping bag collections. 400g. www.outfitters.net.nz