THIS UNDERWEAR IS THE BEST I HAVE FOUND.  I WEAR THEM TO BED AND OUTSIDE WHEN IT IS FREEZING TEMPERATURES. FIT IS PERFECT. THE DOUBLE LAYER GIVES ADDED WARMTH, BUT, NOT TO THICK TO WEAR UNDER YOUR CLOTHES.  I AM VERY HAPPY WITH THESE. I HAVE TWO PAIRS OF TOPS AND BOTTOMS AND BOUGHT A PAIR FOR MY SISTER. WE  LOVE THEM.