Great for what they are
Tested these in cold conditions sitting directly on snow/ice and these, for their thickness and weight, performed better than anything else.  Mine did not come with grommets, but adding some isn't too hard.  Definitely better insulation than some items twice their thickness but a bit cheaply made and look like they will fall apart in a season or two.  So far, they are fine, but the seams look cheap.<br /><br />A great technology and seemingly a pricing error for what these cost elsewhere.  Aerogel is some amazing stuff and even though these are just aerogel infused pellets, they still offer amazing performance for the thickness.
Rating: 4 stars