Lovely, well-made blanket. Great feel. Keeps me at a comfortable temperature. Doesn't slip off the bed. Does the "hug" thing.No polyester either inside or outside. Most of the "cooling" weighted blankets have cotton or bamboo or the the like, but have polyester in the fill. The blanket is washable but I haven't washed it, yet. I use a cotton percale sheet underneath.The numbers don't lie. I use a Polar watch to track my sleep: "Polar's Nightly Recharge™ assesses recovery by measuring both sleep quality (Sleep Charge) and how well your autonomic nervous system (ANS) calms down during the early hours of sleep (ANS Charge)." My nightly recharge was "Good" and had the most green that I can remember. Both my Sleep Charge and ANS were "Much Above Usual", with some impressive numbers. I can't recall every having such good sleep numbers!This is a weight step up from using a 7lb blanket. I had found both a 15lb and a 12lb too much for me, so I started with the 7lb. It was time to move back up to a 12lb and I'm very happy.My one complaint is that the blanket is a little narrow. Most twin-size weighted blankets are 48"; however, this one is only 42". Not a deal breaker but, hey.A little expensive but worth it for a good night's sleep.