One time back in the early '80s I had a broken leg and was bowhunting in a cast. I sat on a chair in a ground blind but took a gray wool blanket to sit on as a cushion. About mid-day a big black cloud rolled in and it poured.. I mean poured. Since rain wasn't predicted I didn't have a rain suit and was unable to leave because of the leg/crutches. So I put the blanket around me like a tent. I couldn't believe how well the natural lanolin of the heavy wool shed water. After the rain went through I was still bone dry. Therefore, although a good quality wool blanket is a lot heavier, you might want to consider the lanolin factor rather than a fleece blanket. BW