サバイバルシート（防寒・保温シート）。Survival sheet (cold protection / heat insulation sheet)
ポケットティッシュと同じくらいのサイズと軽さで広げると大きく、ペラペラなのにはおると大変温かい、防災グッズでよくみる銀色や金色のシートです。
真冬など寒い時にこれを一枚、毛布と毛布の間に挟むだけでポカポカします。
ホテルの部屋が寒い時、登山などアウトドアの時も天気がコロコロ変わったりしますので重宝します。
コンパクトで持ち運びも楽です。旅行中持ち歩くバッグに１つ入れておくと安心です。値段も手ごろで1個２００円台の物から数個セットで１０００円台で購入できます。
It's about the same size and weight as pocket tissues, and when unfolded it's large and thin, but when you wrap it around yourself it's very warm; it's a silver or gold sheet that is often seen in disaster prevention goods.
Just place one of these between two blankets in the middle of winter and you'll be warm.
It's useful when the hotel room is cold, or when you're hiking or outdoors, where the weather can change quickly.
It's compact and easy to carry. It's a good idea to keep one in your bag when you travel.
