Help! How do I add product properties?

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Hi,

I've searched in the contributions, the wiki documentation and these forums but I can't find out - 

How do I add more fields to the product information? - so when adding products to the catalogue in the admin, as well as specifying:

-products name
-products price
-tax class
-products description
-products model 
(etc)

I need to specify more properties, such as:

-minimum temperature
-outer fabric
-colour

These are NOT the same as attributes because the customer has no choice (these are fixed properties of the product). 
I don't want drop-down boxes to appear with just one option in it when customers add it to cart (as happens with attributes), but nor do I want to simply list these properties in the description.

Please help??!! 

thanks
Louise