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Bought this for my old dog who's been stiff after surgery, and it's been a lifesaver on cold morning walks. The foil material traps body heat so well that he actually settles down and sleeps with it on instead of shivering, and it fits nicely under his waterproof coat.

The foil layer really locks in the heat—I wore this under my rain gear on a chilly morning walk and stayed toasty the whole time. It’s lightweight enough that I forgot I had it on, and the fit under my jacket was effortless.

My older labrador's been struggling with joint recovery and this has been a godsend for his daily walks. The foil layer reflects his body heat back really efficiently, so he stays nice and warm without the bulk of a thick coat. Fits well under his waterproof overall too.