What is the difference between down and feather in coats?

i just bought a winter coat, it says it is made of 90% down and 10% feather, it feels pretty warm,and its light weight, i got it very cheap 20.00 bucks i no thats a a good price. its brand new never been worn. what is the down in the jacket, can any one tell me about these type of jackets are they any good,or is... show more i just bought a winter coat, it says it is made of 90% down and 10% feather, it feels pretty warm,and its light weight, i got it very cheap 20.00 bucks i no thats a a good price. its brand new never been worn. what is the down in the jacket, can any one tell me about these type of jackets are they any good,or is sinthetic matereal better to put inside a jacket witch one is gooder, sorry about my spelling i guess i am stupid.
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