These lightweight, breathable sleeping bag liners add 10 degrees of warmth and offer a soft feel. They protect the inside of your sleeping bag from wear and dirt. Available in cotton, polyester, poly-cotton, or pongee fabrics. Options include mummy and envelope shapes. Mummy dimensions: 80 cm x 200 cm x 50 cm. Envelope dimensions: 75 cm x 200 cm x 75 cm.