Originally Posted by Cunningham GSDs
Somone told me that Hay, particularly grass hay or brome hay is better than straw because straw is hollow and so doesn't retain the heat as well as the hay which is not hollow. Anybody else hear this?
Straw being hollow is the reason it's a good insulator, in fact.
Rather like a down comforter, the reason it's so warm is all the air trapped in the feathers.