I don't know if MAPP tech is a different fabric from just plain MAPP. Because I can't see how they can claim MAPP is 100% natural & renewable if it's recycling polyester involved.

I can't tell on their website. I know the one t shirt that I have that I know is MAPP just feels like wool.

http://www.teamestrogen.com/prodHN_WLSW09.html
http://www.chocolatefishmerino.co.uk/clothing/mapp.html
http://www.mapp.co.nz/attributes/MAPP-Attributes.pdf
http://www.howies.co.uk/content.php?xId=7&xPg=1

although this swobo page says:
http://www.bicyclinghub.com/swmewojeor.html
MAPP Matrix is a new range of technical fabrics designed with a performance edge. Lightweight, robust and comfortable, MAPP Matrix maximizes the performance potential of the wearer, by promoting the balanced regulation of core body temperature and providing protection and comfort in competitive, extreme conditions. At the core of any MAPP Matrix fabric is an inner base-layer of 100% Natural MAPP Merino, which is linked with a protective outer-layer of technical performance fabric. Next to skin core comfort with a technical outer edge.
MAPP Merino is an annually renewable, natural product. It is durable when in use, yet recyclable and biodegradable at the end of its life cycle
It is produced in free range farming systems, which are animal - and environment friendly. Our selected farms are chosen for their commitment to environmental responsibility and sustainability in farm management practices, as well as the superb quality of their Merino wool. Our philosophy reflects our dedication to environmentally friendly fabric manufacturing and finishing processes, to ensure our fabrics remain a sustainable and biodegradable resource.