Thank you for looking. This is a SEA TO SUMMIT THERMOLITE REACTOR inner sheet. It was used by my family for mountain climbing. They are no longer climbing, so I am selling it. It has not been used since purchase, but they don't remember when it was bought. An inner sheet can be placed inside a sleeping bag to improve its thermal performance, or it can protect the main sleeping bag from dirt. It uses the lightest 80g/㎡ Thermolite. Thermolite is made of hollow fibers, providing excellent warmth and breathability while being lightweight. The Thermolite Reactor increases the warmth of your sleeping bag by up to 8 degrees Celsius and can also be used on its own in the summer. According to the official specifications: Size: 210 x 90 cm Weight: Approximately 248g No scuffs, tears, or fraying were observed. It has been washed with Emal, but the scent of moth repellent from storage remains. Please refrain from purchasing if you are concerned about this. Please understand that this is a used item before purchasing. #seatosummit #シートゥーサミット #サーモライトリアクター