Hi paddyb,
They don’t have a lot of information about their mattresses on either site but they are made from some combination of latex, memory foam, microcoils, and polyfoam. There are a few more details about their different models here. The microcoils and latex would be good quality and durable materials but I would want to know the density of any memory foam or polyfoam in any of their mattresses that you are considering to make sure their are no lower quality materials or weak links in the mattress.
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I don’t know how knowledgeable their customer service representatives are but when you can’t test a mattress in person then the most reliable source of guidance is always a more detailed phone conversation with a knowledgeable and experienced retailer or manufacturer that has your best interests at heart and who can help “talk you through” the specifics of their mattresses and the properties and “feel” of the materials they are using (fast or slow response, resilience, firmness etc) and the options they have available that may be the best “match” for you based on the information you provide them, any local testing you have done or mattresses you have slept on and liked or other mattresses you are considering that they are familiar with, and the “averages” of other customers that are similar to you. They will know more about “matching” their specific mattress designs and firmness levels to different body types, sleeping positions, and preferences (or to other mattresses that they are familiar with) than anyone else.
ConiCoil pocket springs are versions of microcoils. There is more about microcoils that are used in comfort layers in this article and in post #8 here and post #2 here.
Phoenix