Hi oceablue22,
There is a description of their organic wool mattress pad on the Naturaworld site here. It is certainly a high quality product (organic cotton and organic wool) but according to their description it has 10 oz/yd of wool so I don’t know if the wayfair description is for a different product or if it just lists the amount of wool incorrectly. If it has 10 oz of wool then it would be a little thicker and being more of a mattress pad rather than a mattress protector it would have more of an effect on the “feel” of the mattress. As you mentioned it also isn’t washable so it would be a good idea to put it out in the sun once in a while to “refresh” it. The “wrong” image is their reversible wool on top mattress pad here.
There is really no specific definition of either one or a dividing line when a mattress pad becomes a topper but in general terms a topper is thicker than a mattress pad which in turn is thicker than a protector. There is more about the differences between them in post #10 here.
There isn’t any way to quantify this outside of your own sleeping experience because there are too many variables involved but I would doubt that it would take you outside of a comfortable temperature range with either one.
You can see my thoughts about wool mattress toppers in general in post #8 here and the posts it links to and there are also some comments and sources for wool mattress pads and toppers in post #3 here that include some comments about the Sleepysheeporganic wool toppers (that use eco-valley wool) and Sleep & Beyond (including a link to a post about their Merino and their Shropshire topper). I don’t have any personal experience with either of the toppers you listed so I can’t really make any meaningful comments about either of them specifically.
Phoenix