Because the woolen blankets have many layers but the cotton sheet has only one layer so it traps more heat.
Brett Lorimer
I think its more to do with air pockets not layers, I was in Norway in -40 degress in the army and the best equipment we had was fishnet long johns! full of airpockets and toasty! British Issue stuff was layered but no air pockets.
The wool blanket will trap your natural body heat better than cotton. It's less porous than cotton.
Because the woolen blankets have many layers but the cotton sheet has only one layer so it traps more heat. Brett Lorimer
Wool holds in body moisture and insulates from cold, keeping you warm. Cotton absorbs moisture and does not insulate well.
Lebarca wool blankets
In the Columbian Exchange, woolen Navajo blankets were brought to the Americas from Europe, Asia, and Africa.
faribault
As woolen are hotter than cotton garments.
The Navajo and the Zuni enjoyed the finely crafted cotton or woolen woven blankets and clothing that the Pueblo peoples provided. For more information, please click on the related link below:
It's warmer
For infection prevention puposes, just think what could potentially be hiding amongst the woollen fibres!
in summer-cotton in winter-woolen in monsoon-rainy
Some woolen fabrics, especially Navajo blankets and tweeds and other napped textiles, are naturally water repellent.
The Anasazi traded many things such as animals, pottery, beads, turquoise and a number of other things.