Sheep in the hottest and coldest of the climates of the world have known for thousands of years that the original "high-tech fiber", wool is unmatched.
If you wouldn't wear it, why should your animal?
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The hydrophilic water-loving component in wool delivers sweat and heat away from horses backs and through the saddle pad.
Beware - synthetic material, fibrous, open and closed cell foams, trap heat and increase chances of heat related pressure sores.