Can you give us some links to the items you are curious about so we don't have to start searching on the web for them to help you out? Can you find descriptions of the material used?- most places should state what the clothing item is made of.
And yes, all Ibex wool items are made from merino wool. They also sell some items that have other materials as well, such as a synthetic shell outer wind layer, etc...but they always say what the thing is made of.